diff options
Diffstat (limited to 'src/Canvas.cpp')
| -rw-r--r-- | src/Canvas.cpp | 1764 |
1 files changed, 1717 insertions, 47 deletions
diff --git a/src/Canvas.cpp b/src/Canvas.cpp index 1fdcfb3..a461a6e 100644 --- a/src/Canvas.cpp +++ b/src/Canvas.cpp @@ -13,38 +13,50 @@ * with Ganv. If not, see <http://www.gnu.org/licenses/>. */ +/* Parts based on GnomeCanvas, by Federico Mena <federico@nuclecu.unam.mx> + * and Raph Levien <raph@gimp.org> + * Copyright 1997-2000 Free Software Foundation + */ + #define _POSIX_C_SOURCE 200809L // strdup +#include <math.h> +#include <stdio.h> +#include <string.h> + #include <algorithm> #include <cassert> #include <cmath> #include <iostream> #include <list> #include <map> +#include <set> #include <sstream> #include <string> #include <vector> -#include <set> +#include <cairo.h> #include <gdk/gdkkeysyms.h> +#include <gtk/gtk.h> #include <gtk/gtkstyle.h> - #include <gtkmm/widget.h> -#include "ganv_config.h" #include "ganv/Canvas.hpp" -#include "ganv/Edge.hpp" #include "ganv/Circle.hpp" +#include "ganv/Edge.hpp" #include "ganv/Module.hpp" #include "ganv/Port.hpp" #include "ganv/box.h" #include "ganv/canvas.h" #include "ganv/edge.h" +#include "ganv/group.h" #include "ganv/node.h" +#include "ganv_config.h" #include "./color.h" #include "./ganv-marshal.h" #include "./ganv-private.h" +#include "./gettext.h" #if defined(HAVE_AGRAPH_2_20) || defined(HAVE_AGRAPH_2_30) # include <gvc.h> @@ -53,6 +65,49 @@ # include "./fdgl.hpp" #endif +/*** GanvCanvas ***/ + +#define CANVAS_IDLE_PRIORITY (GDK_PRIORITY_REDRAW - 5) + +typedef struct { + int x; + int y; + int width; + int height; +} IRect; + +extern "C" { +static void add_idle(GanvCanvas* canvas); +static void ganv_canvas_destroy(GtkObject* object); +static void ganv_canvas_map(GtkWidget* widget); +static void ganv_canvas_unmap(GtkWidget* widget); +static void ganv_canvas_realize(GtkWidget* widget); +static void ganv_canvas_unrealize(GtkWidget* widget); +static void ganv_canvas_size_allocate(GtkWidget* widget, + GtkAllocation* allocation); +static gint ganv_canvas_button(GtkWidget* widget, + GdkEventButton* event); +static gint ganv_canvas_motion(GtkWidget* widget, + GdkEventMotion* event); +static gint ganv_canvas_expose(GtkWidget* widget, + GdkEventExpose* event); +static gboolean ganv_canvas_key(GtkWidget* widget, + GdkEventKey* event); +static gboolean ganv_canvas_scroll(GtkWidget* widget, + GdkEventScroll* event); +static gint ganv_canvas_crossing(GtkWidget* widget, + GdkEventCrossing* event); +static gint ganv_canvas_focus_in(GtkWidget* widget, + GdkEventFocus* event); +static gint ganv_canvas_focus_out(GtkWidget* widget, + GdkEventFocus* event); +static void ganv_canvas_request_update_real(GanvCanvas* canvas); + +static GtkLayoutClass* canvas_parent_class; +} + +/*** end GanvCanvas ***/ + static guint signal_connect; static guint signal_disconnect; @@ -148,7 +203,7 @@ struct GanvCanvasImpl { _wrapper_key = g_quark_from_string("ganvmm"); _move_cursor = gdk_cursor_new(GDK_FLEUR); - g_signal_connect(G_OBJECT(ganv_canvas_base_root(GANV_CANVAS_BASE(_gcanvas))), + g_signal_connect(G_OBJECT(ganv_canvas_root(GANV_CANVAS(_gcanvas))), "event", G_CALLBACK(on_canvas_event), this); } @@ -180,7 +235,7 @@ struct GanvCanvasImpl { #endif GanvItem* root() { - return ganv_canvas_base_root(GANV_CANVAS_BASE(_gcanvas)); + return ganv_canvas_root(GANV_CANVAS(_gcanvas)); } void resize(double width, double height); @@ -1053,7 +1108,7 @@ GanvCanvasImpl::join_selection() GanvNode* GanvCanvasImpl::get_node_at(double x, double y) { - GanvItem* item = ganv_canvas_base_get_item_at(GANV_CANVAS_BASE(_gcanvas), x, y); + GanvItem* item = ganv_canvas_get_item_at(GANV_CANVAS(_gcanvas), x, y); while (item) { if (GANV_IS_NODE(item)) { return GANV_NODE(item); @@ -1075,7 +1130,7 @@ GanvCanvasImpl::on_event(GdkEvent* event) switch (event->type) { case GDK_KEY_PRESS: handled = true; - ganv_canvas_base_get_scroll_offsets(GANV_CANVAS_BASE(_gcanvas), &scroll_x, &scroll_y); + ganv_canvas_get_scroll_offsets(GANV_CANVAS(_gcanvas), &scroll_x, &scroll_y); switch (event->key.keyval) { case GDK_Up: scroll_y -= scroll_increment; @@ -1099,7 +1154,7 @@ GanvCanvasImpl::on_event(GdkEvent* event) handled = false; } if (handled) { - ganv_canvas_base_scroll_to(GANV_CANVAS_BASE(_gcanvas), scroll_x, scroll_y); + ganv_canvas_scroll_to(GANV_CANVAS(_gcanvas), scroll_x, scroll_y); return true; } break; @@ -1145,7 +1200,7 @@ GanvCanvasImpl::scroll_drag_handler(GdkEvent* event) GANV_ITEM(root()), GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK, NULL, event->button.time); - ganv_canvas_base_get_scroll_offsets(GANV_CANVAS_BASE(_gcanvas), &original_scroll_x, &original_scroll_y); + ganv_canvas_get_scroll_offsets(GANV_CANVAS(_gcanvas), &original_scroll_x, &original_scroll_y); scroll_offset_x = 0; scroll_offset_y = 0; origin_x = event->button.x_root; @@ -1166,7 +1221,7 @@ GanvCanvasImpl::scroll_drag_handler(GdkEvent* event) scroll_offset_x += x_offset; scroll_offset_y += y_offset; - ganv_canvas_base_scroll_to(GANV_CANVAS_BASE(_gcanvas), + ganv_canvas_scroll_to(GANV_CANVAS(_gcanvas), lrint(original_scroll_x + scroll_offset_x), lrint(original_scroll_y + scroll_offset_y)); last_x = x; @@ -1298,7 +1353,7 @@ GanvCanvasImpl::connect_drag_handler(GdkEvent* event) _drag_node = GANV_NODE( ganv_item_new( - GANV_ITEM(ganv_canvas_base_root(GANV_CANVAS_BASE(_gcanvas))), + GANV_ITEM(ganv_canvas_root(GANV_CANVAS(_gcanvas))), ganv_node_get_type(), "x", x, "y", y, @@ -1697,7 +1752,7 @@ GanvCanvasImpl::resize(double width, double height) if (width != _gcanvas->width || height != _gcanvas->height) { _gcanvas->width = width; _gcanvas->height = height; - ganv_canvas_base_set_scroll_region(GANV_CANVAS_BASE(_gcanvas), + ganv_canvas_set_scroll_region(GANV_CANVAS(_gcanvas), 0.0, 0.0, width, height); } } @@ -1728,7 +1783,7 @@ GanvCanvasImpl::set_zoom_and_font_size(double zoom, double points) if (zoom != _zoom) { _zoom = zoom; - ganv_canvas_base_set_pixels_per_unit(GANV_CANVAS_BASE(_gcanvas), zoom); + ganv_canvas_set_pixels_per_unit(GANV_CANVAS(_gcanvas), zoom); } _font_size = points; @@ -1836,7 +1891,7 @@ Canvas::for_each_selected_edge(GanvEdgeFunc f, void* data) GanvItem* Canvas::root() { - return ganv_canvas_base_root(GANV_CANVAS_BASE(impl()->_gcanvas)); + return ganv_canvas_root(GANV_CANVAS(impl()->_gcanvas)); } Gtk::Layout& @@ -1848,13 +1903,13 @@ Canvas::widget() void Canvas::get_scroll_offsets(int& cx, int& cy) const { - ganv_canvas_base_get_scroll_offsets(GANV_CANVAS_BASE(impl()->_gcanvas), &cx, &cy); + ganv_canvas_get_scroll_offsets(GANV_CANVAS(impl()->_gcanvas), &cx, &cy); } void Canvas::scroll_to(int x, int y) { - ganv_canvas_base_scroll_to(GANV_CANVAS_BASE(impl()->_gcanvas), x, y); + ganv_canvas_scroll_to(GANV_CANVAS(impl()->_gcanvas), x, y); } GQuark @@ -1879,16 +1934,13 @@ Canvas::gobj() const extern "C" { -#include "ganv/canvas-base.h" #include "ganv/canvas.h" #include "./boilerplate.h" #include "./color.h" #include "./gettext.h" -G_DEFINE_TYPE(GanvCanvas, ganv_canvas, GANV_TYPE_CANVAS_BASE) - -static GanvCanvasBaseClass* parent_class; +G_DEFINE_TYPE(GanvCanvas, ganv_canvas, GTK_TYPE_LAYOUT) enum { PROP_0, @@ -1896,12 +1948,59 @@ enum { PROP_HEIGHT, PROP_DIRECTION, PROP_FONT_SIZE, - PROP_LOCKED + PROP_LOCKED, + PROP_FOCUSED_ITEM }; +/* Callback used when the root item of a canvas is destroyed. The user should + * never ever do this, so we panic if this happens. + */ +static void +panic_root_destroyed(GtkObject* object, gpointer data) +{ + g_error("Eeeek, root item %p of canvas %p was destroyed!", (void*)object, data); +} + static void ganv_canvas_init(GanvCanvas* canvas) { + GTK_WIDGET_SET_FLAGS(canvas, GTK_CAN_FOCUS); + + canvas->need_update = FALSE; + canvas->need_redraw = FALSE; + canvas->redraw_region = NULL; + canvas->idle_id = 0; + + canvas->scroll_x1 = 0.0; + canvas->scroll_y1 = 0.0; + canvas->scroll_x2 = canvas->layout.width; + canvas->scroll_y2 = canvas->layout.height; + + canvas->pixels_per_unit = 1.0; + + canvas->pick_event.type = GDK_LEAVE_NOTIFY; + canvas->pick_event.crossing.x = 0; + canvas->pick_event.crossing.y = 0; + + canvas->center_scroll_region = TRUE; + + gtk_layout_set_hadjustment(GTK_LAYOUT(canvas), NULL); + gtk_layout_set_vadjustment(GTK_LAYOUT(canvas), NULL); + + /* Create the root item as a special case */ + canvas->root = GANV_ITEM(g_object_new(ganv_group_get_type(), NULL)); + canvas->root->canvas = canvas; + + g_object_ref_sink(canvas->root); + + canvas->root_destroy_id = g_signal_connect(canvas->root, "destroy", + G_CALLBACK(panic_root_destroyed), + canvas); + + canvas->need_repick = TRUE; + + /*************************/ + canvas->direction = GANV_DIRECTION_RIGHT; canvas->impl = new GanvCanvasImpl(canvas); canvas->impl->_font_size = ganv_canvas_get_default_font_size(canvas); @@ -1934,6 +2033,9 @@ ganv_canvas_set_property(GObject* object, case PROP_LOCKED: canvas->locked = g_value_get_boolean(value); break; + case PROP_FOCUSED_ITEM: + canvas->focused_item = GANV_ITEM(g_value_get_object(value)); + break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec); break; @@ -1955,6 +2057,9 @@ ganv_canvas_get_property(GObject* object, GET_CASE(WIDTH, double, canvas->width) GET_CASE(HEIGHT, double, canvas->height) GET_CASE(LOCKED, boolean, canvas->locked); + case PROP_FOCUSED_ITEM: + g_value_set_object(value, GANV_CANVAS(object)->focused_item); + break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec); break; @@ -1964,13 +2069,44 @@ ganv_canvas_get_property(GObject* object, static void ganv_canvas_class_init(GanvCanvasClass* klass) { - GObjectClass* gobject_class = (GObjectClass*)klass; + GObjectClass* gobject_class = (GObjectClass*)klass; + GtkObjectClass* object_class = (GtkObjectClass*)klass; + GtkWidgetClass* widget_class = (GtkWidgetClass*)klass; - parent_class = GANV_CANVAS_BASE_CLASS(g_type_class_peek_parent(klass)); + canvas_parent_class = GTK_LAYOUT_CLASS(g_type_class_peek_parent(klass)); gobject_class->set_property = ganv_canvas_set_property; gobject_class->get_property = ganv_canvas_get_property; + object_class->destroy = ganv_canvas_destroy; + + widget_class->map = ganv_canvas_map; + widget_class->unmap = ganv_canvas_unmap; + widget_class->realize = ganv_canvas_realize; + widget_class->unrealize = ganv_canvas_unrealize; + widget_class->size_allocate = ganv_canvas_size_allocate; + widget_class->button_press_event = ganv_canvas_button; + widget_class->button_release_event = ganv_canvas_button; + widget_class->motion_notify_event = ganv_canvas_motion; + widget_class->expose_event = ganv_canvas_expose; + widget_class->key_press_event = ganv_canvas_key; + widget_class->key_release_event = ganv_canvas_key; + widget_class->enter_notify_event = ganv_canvas_crossing; + widget_class->leave_notify_event = ganv_canvas_crossing; + widget_class->focus_in_event = ganv_canvas_focus_in; + widget_class->focus_out_event = ganv_canvas_focus_out; + widget_class->scroll_event = ganv_canvas_scroll; + + klass->request_update = ganv_canvas_request_update_real; + + g_object_class_install_property( + gobject_class, PROP_FOCUSED_ITEM, g_param_spec_object( + "focused-item", + NULL, + NULL, + GANV_TYPE_ITEM, + (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE))); + g_object_class_install_property( gobject_class, PROP_WIDTH, g_param_spec_double( "width", @@ -2047,18 +2183,10 @@ ganv_canvas_class_init(GanvCanvasClass* klass) 0); } -GanvCanvas* -ganv_canvas_new(double width, double height) -{ - GanvCanvas* canvas = GANV_CANVAS(g_object_new(ganv_canvas_get_type(), - "width", width, - "height", height, - NULL)); - ganv_canvas_base_set_scroll_region(GANV_CANVAS_BASE(canvas), - 0.0, 0.0, width, height); - return canvas; -} - +/** + * ganv_canvas_resize: + * Resize the canvas to the given dimensions. + */ void ganv_canvas_resize(GanvCanvas* canvas, double width, double height) { @@ -2071,12 +2199,11 @@ ganv_canvas_contents_changed(GanvCanvas* canvas) canvas->impl->contents_changed(); } -GanvItem* -ganv_canvas_get_root(const GanvCanvas* canvas) -{ - return ganv_canvas_base_root(GANV_CANVAS_BASE(canvas->impl->_gcanvas)); -} - +/** + * ganv_canvas_get_default_font_size: + * + * Get the default font size in points. + */ double ganv_canvas_get_default_font_size(const GanvCanvas* canvas) { @@ -2117,7 +2244,7 @@ ganv_canvas_zoom_full(GanvCanvas* canvas) int win_width, win_height; GdkWindow* win = gtk_widget_get_window( - GTK_WIDGET(GANV_CANVAS_BASE(canvas->impl->_gcanvas))); + GTK_WIDGET(GANV_CANVAS(canvas->impl->_gcanvas))); gdk_window_get_size(win, &win_width, &win_height); // Box containing all canvas items @@ -2153,11 +2280,11 @@ ganv_canvas_zoom_full(GanvCanvas* canvas) ganv_canvas_set_zoom(canvas, new_zoom); int scroll_x, scroll_y; - ganv_canvas_base_w2c(GANV_CANVAS_BASE(canvas->impl->_gcanvas), + ganv_canvas_w2c(GANV_CANVAS(canvas->impl->_gcanvas), lrintf(left - pad), lrintf(bottom - pad), &scroll_x, &scroll_y); - ganv_canvas_base_scroll_to(GANV_CANVAS_BASE(canvas->impl->_gcanvas), + ganv_canvas_scroll_to(GANV_CANVAS(canvas->impl->_gcanvas), scroll_x, scroll_y); } @@ -2220,6 +2347,12 @@ ganv_canvas_add_node(GanvCanvas* canvas, canvas->impl->add_item(node); } +/** + * ganv_canvas_get_edge: + * Get the edge between two nodes, or NULL if none exists. + * + * Return value: (transfer none): The root group of @canvas. + */ GanvEdge* ganv_canvas_get_edge(GanvCanvas* canvas, GanvNode* tail, @@ -2413,7 +2546,7 @@ ganv_canvas_arrange(GanvCanvas* canvas) // Arrange to graphviz coordinates for (GVNodes::iterator i = nodes.begin(); i != nodes.end(); ++i) { - if (GANV_ITEM(i->first)->parent != GANV_ITEM(ganv_canvas_get_root(canvas))) { + if (GANV_ITEM(i->first)->parent != GANV_ITEM(ganv_canvas_root(canvas))) { continue; } const string pos = agget(i->second, (char*)"pos"); @@ -2469,7 +2602,7 @@ ganv_canvas_arrange(GanvCanvas* canvas) static const double border_width = canvas->impl->_font_size * 2.0; canvas->impl->move_contents_to_internal(border_width, border_width, least_x, least_y); - ganv_canvas_base_scroll_to(GANV_CANVAS_BASE(canvas->impl->_gcanvas), 0, 0); + ganv_canvas_scroll_to(GANV_CANVAS(canvas->impl->_gcanvas), 0, 0); FOREACH_ITEM(canvas->impl->_items, i) { const double x = GANV_ITEM(*i)->x; @@ -2479,6 +2612,11 @@ ganv_canvas_arrange(GanvCanvas* canvas) #endif } +/** + * ganv_canvas_export_dot: + * + * Write a Graphviz DOT description of the canvas to a file. + */ void ganv_canvas_export_dot(GanvCanvas* canvas, const char* filename) { @@ -2488,4 +2626,1536 @@ ganv_canvas_export_dot(GanvCanvas* canvas, const char* filename) #endif } + +/***************************************************************************/ + +/* Convenience function to remove the idle handler of a canvas */ +static void +remove_idle(GanvCanvas* canvas) +{ + if (canvas->idle_id == 0) { + return; + } + + g_source_remove(canvas->idle_id); + canvas->idle_id = 0; +} + +/* Removes the transient state of the canvas (idle handler, grabs). */ +static void +shutdown_transients(GanvCanvas* canvas) +{ + /* We turn off the need_redraw flag, since if the canvas is mapped again + * it will request a redraw anyways. We do not turn off the need_update + * flag, though, because updates are not queued when the canvas remaps + * itself. + */ + if (canvas->need_redraw) { + canvas->need_redraw = FALSE; + g_slist_foreach(canvas->redraw_region, (GFunc)g_free, NULL); + g_slist_free(canvas->redraw_region); + canvas->redraw_region = NULL; + canvas->redraw_x1 = 0; + canvas->redraw_y1 = 0; + canvas->redraw_x2 = 0; + canvas->redraw_y2 = 0; + } + + if (canvas->grabbed_item) { + canvas->grabbed_item = NULL; + gdk_pointer_ungrab(GDK_CURRENT_TIME); + } + + remove_idle(canvas); +} + +/* Destroy handler for GanvCanvas */ +static void +ganv_canvas_destroy(GtkObject* object) +{ + GanvCanvas* canvas; + + g_return_if_fail(GANV_IS_CANVAS(object)); + + /* remember, destroy can be run multiple times! */ + + canvas = GANV_CANVAS(object); + + if (canvas->root_destroy_id) { + g_signal_handler_disconnect(canvas->root, canvas->root_destroy_id); + canvas->root_destroy_id = 0; + } + if (canvas->root) { + gtk_object_destroy(GTK_OBJECT(canvas->root)); + g_object_unref(G_OBJECT(canvas->root)); + canvas->root = NULL; + } + + shutdown_transients(canvas); + + if (GTK_OBJECT_CLASS(canvas_parent_class)->destroy) { + (*GTK_OBJECT_CLASS(canvas_parent_class)->destroy)(object); + } +} + +/** + * ganv_canvas_new: + * + * Return value: A newly-created canvas. + */ +GanvCanvas* +ganv_canvas_new(double width, double height) +{ + GanvCanvas* canvas = GANV_CANVAS( + g_object_new(ganv_canvas_get_type(), + "width", width, + "height", height, + NULL)); + + ganv_canvas_set_scroll_region(GANV_CANVAS(canvas), + 0.0, 0.0, width, height); + + return canvas; +} + +/* Map handler for the canvas */ +static void +ganv_canvas_map(GtkWidget* widget) +{ + GanvCanvas* canvas; + + g_return_if_fail(GANV_IS_CANVAS(widget)); + + /* Normal widget mapping stuff */ + + if (GTK_WIDGET_CLASS(canvas_parent_class)->map) { + (*GTK_WIDGET_CLASS(canvas_parent_class)->map)(widget); + } + + canvas = GANV_CANVAS(widget); + + if (canvas->need_update) { + add_idle(canvas); + } + + /* Map items */ + + if (GANV_ITEM_GET_CLASS(canvas->root)->map) { + (*GANV_ITEM_GET_CLASS(canvas->root)->map)(canvas->root); + } +} + +/* Unmap handler for the canvas */ +static void +ganv_canvas_unmap(GtkWidget* widget) +{ + GanvCanvas* canvas; + + g_return_if_fail(GANV_IS_CANVAS(widget)); + + canvas = GANV_CANVAS(widget); + + shutdown_transients(canvas); + + /* Unmap items */ + + if (GANV_ITEM_GET_CLASS(canvas->root)->unmap) { + (*GANV_ITEM_GET_CLASS(canvas->root)->unmap)(canvas->root); + } + + /* Normal widget unmapping stuff */ + + if (GTK_WIDGET_CLASS(canvas_parent_class)->unmap) { + (*GTK_WIDGET_CLASS(canvas_parent_class)->unmap)(widget); + } +} + +/* Realize handler for the canvas */ +static void +ganv_canvas_realize(GtkWidget* widget) +{ + GanvCanvas* canvas; + + g_return_if_fail(GANV_IS_CANVAS(widget)); + + /* Normal widget realization stuff */ + + if (GTK_WIDGET_CLASS(canvas_parent_class)->realize) { + (*GTK_WIDGET_CLASS(canvas_parent_class)->realize)(widget); + } + + canvas = GANV_CANVAS(widget); + + gdk_window_set_events( + canvas->layout.bin_window, + (GdkEventMask)(gdk_window_get_events(canvas->layout.bin_window) + | GDK_EXPOSURE_MASK + | GDK_BUTTON_PRESS_MASK + | GDK_BUTTON_RELEASE_MASK + | GDK_POINTER_MOTION_MASK + | GDK_KEY_PRESS_MASK + | GDK_KEY_RELEASE_MASK + | GDK_ENTER_NOTIFY_MASK + | GDK_LEAVE_NOTIFY_MASK + | GDK_FOCUS_CHANGE_MASK)); + + /* Create our own temporary pixmap gc and realize all the items */ + + canvas->pixmap_gc = gdk_gc_new(canvas->layout.bin_window); + + (*GANV_ITEM_GET_CLASS(canvas->root)->realize)(canvas->root); +} + +/* Unrealize handler for the canvas */ +static void +ganv_canvas_unrealize(GtkWidget* widget) +{ + GanvCanvas* canvas; + + g_return_if_fail(GANV_IS_CANVAS(widget)); + + canvas = GANV_CANVAS(widget); + + shutdown_transients(canvas); + + /* Unrealize items and parent widget */ + + (*GANV_ITEM_GET_CLASS(canvas->root)->unrealize)(canvas->root); + + g_object_unref(canvas->pixmap_gc); + canvas->pixmap_gc = NULL; + + if (GTK_WIDGET_CLASS(canvas_parent_class)->unrealize) { + (*GTK_WIDGET_CLASS(canvas_parent_class)->unrealize)(widget); + } +} + +/* Handles scrolling of the canvas. Adjusts the scrolling and zooming offset to + * keep as much as possible of the canvas scrolling region in view. + */ +static void +scroll_to(GanvCanvas* canvas, int cx, int cy) +{ + int scroll_width, scroll_height; + int right_limit, bottom_limit; + int old_zoom_xofs, old_zoom_yofs; + int changed_x = FALSE, changed_y = FALSE; + int canvas_width, canvas_height; + + canvas_width = GTK_WIDGET(canvas)->allocation.width; + canvas_height = GTK_WIDGET(canvas)->allocation.height; + + scroll_width = floor((canvas->scroll_x2 - canvas->scroll_x1) * canvas->pixels_per_unit + + 0.5); + scroll_height = floor((canvas->scroll_y2 - canvas->scroll_y1) * canvas->pixels_per_unit + + 0.5); + + right_limit = scroll_width - canvas_width; + bottom_limit = scroll_height - canvas_height; + + old_zoom_xofs = canvas->zoom_xofs; + old_zoom_yofs = canvas->zoom_yofs; + + if (right_limit < 0) { + cx = 0; + + if (canvas->center_scroll_region) { + canvas->zoom_xofs = (canvas_width - scroll_width) / 2; + scroll_width = canvas_width; + } else { + canvas->zoom_xofs = 0; + } + } else if (cx < 0) { + cx = 0; + canvas->zoom_xofs = 0; + } else if (cx > right_limit) { + cx = right_limit; + canvas->zoom_xofs = 0; + } else { + canvas->zoom_xofs = 0; + } + + if (bottom_limit < 0) { + cy = 0; + + if (canvas->center_scroll_region) { + canvas->zoom_yofs = (canvas_height - scroll_height) / 2; + scroll_height = canvas_height; + } else { + canvas->zoom_yofs = 0; + } + } else if (cy < 0) { + cy = 0; + canvas->zoom_yofs = 0; + } else if (cy > bottom_limit) { + cy = bottom_limit; + canvas->zoom_yofs = 0; + } else { + canvas->zoom_yofs = 0; + } + + if ((canvas->zoom_xofs != old_zoom_xofs) || (canvas->zoom_yofs != old_zoom_yofs)) { + ganv_canvas_request_update(canvas); + gtk_widget_queue_draw(GTK_WIDGET(canvas)); + } + + if (canvas->layout.hadjustment && ( ((int)canvas->layout.hadjustment->value) != cx) ) { + canvas->layout.hadjustment->value = cx; + changed_x = TRUE; + } + + if (canvas->layout.vadjustment && ( ((int)canvas->layout.vadjustment->value) != cy) ) { + canvas->layout.vadjustment->value = cy; + changed_y = TRUE; + } + + if ((scroll_width != (int)canvas->layout.width) + || (scroll_height != (int)canvas->layout.height)) { + gtk_layout_set_size(GTK_LAYOUT(canvas), scroll_width, scroll_height); + } + + /* Signal GtkLayout that it should do a redraw. */ + + if (changed_x) { + g_signal_emit_by_name(canvas->layout.hadjustment, "value_changed"); + } + + if (changed_y) { + g_signal_emit_by_name(canvas->layout.vadjustment, "value_changed"); + } +} + +/* Size allocation handler for the canvas */ +static void +ganv_canvas_size_allocate(GtkWidget* widget, GtkAllocation* allocation) +{ + GanvCanvas* canvas; + + g_return_if_fail(GANV_IS_CANVAS(widget)); + g_return_if_fail(allocation != NULL); + + if (GTK_WIDGET_CLASS(canvas_parent_class)->size_allocate) { + (*GTK_WIDGET_CLASS(canvas_parent_class)->size_allocate)(widget, allocation); + } + + canvas = GANV_CANVAS(widget); + + /* Recenter the view, if appropriate */ + + canvas->layout.hadjustment->page_size = allocation->width; + canvas->layout.hadjustment->page_increment = allocation->width / 2; + + canvas->layout.vadjustment->page_size = allocation->height; + canvas->layout.vadjustment->page_increment = allocation->height / 2; + + scroll_to(canvas, + canvas->layout.hadjustment->value, + canvas->layout.vadjustment->value); + + g_signal_emit_by_name(canvas->layout.hadjustment, "changed"); + g_signal_emit_by_name(canvas->layout.vadjustment, "changed"); +} + +/* Returns whether the item is an inferior of or is equal to the parent. */ +static gboolean +is_descendant(GanvItem* item, GanvItem* parent) +{ + for (; item; item = item->parent) { + if (item == parent) { + return TRUE; + } + } + + return FALSE; +} + + +/* Emits an event for an item in the canvas, be it the current item, grabbed + * item, or focused item, as appropriate. + */ +int +ganv_canvas_emit_event(GanvCanvas* canvas, GdkEvent* event) +{ + GdkEvent* ev; + gint finished; + GanvItem* item; + GanvItem* parent; + guint mask; + + /* Perform checks for grabbed items */ + + if (canvas->grabbed_item + && !is_descendant(canvas->current_item, canvas->grabbed_item)) { + /* I think this warning is annoying and I don't know what it's for + * so I'll disable it for now. + */ + /* g_warning ("emit_event() returning FALSE!\n");*/ + return FALSE; + } + + if (canvas->grabbed_item) { + switch (event->type) { + case GDK_ENTER_NOTIFY: + mask = GDK_ENTER_NOTIFY_MASK; + break; + + case GDK_LEAVE_NOTIFY: + mask = GDK_LEAVE_NOTIFY_MASK; + break; + + case GDK_MOTION_NOTIFY: + mask = GDK_POINTER_MOTION_MASK; + break; + + case GDK_BUTTON_PRESS: + case GDK_2BUTTON_PRESS: + case GDK_3BUTTON_PRESS: + mask = GDK_BUTTON_PRESS_MASK; + break; + + case GDK_BUTTON_RELEASE: + mask = GDK_BUTTON_RELEASE_MASK; + break; + + case GDK_KEY_PRESS: + mask = GDK_KEY_PRESS_MASK; + break; + + case GDK_KEY_RELEASE: + mask = GDK_KEY_RELEASE_MASK; + break; + + case GDK_SCROLL: + mask = GDK_SCROLL_MASK; + break; + + default: + mask = 0; + break; + } + + if (!(mask & canvas->grabbed_event_mask)) { + return FALSE; + } + } + + /* Convert to world coordinates -- we have two cases because of diferent + * offsets of the fields in the event structures. + */ + + ev = gdk_event_copy(event); + + switch (ev->type) { + case GDK_ENTER_NOTIFY: + case GDK_LEAVE_NOTIFY: + ganv_canvas_window_to_world(canvas, + ev->crossing.x, ev->crossing.y, + &ev->crossing.x, &ev->crossing.y); + break; + + case GDK_MOTION_NOTIFY: + case GDK_BUTTON_PRESS: + case GDK_2BUTTON_PRESS: + case GDK_3BUTTON_PRESS: + case GDK_BUTTON_RELEASE: + ganv_canvas_window_to_world(canvas, + ev->motion.x, ev->motion.y, + &ev->motion.x, &ev->motion.y); + break; + + default: + break; + } + + /* Choose where we send the event */ + + item = canvas->current_item; + + if (canvas->focused_item + && ((event->type == GDK_KEY_PRESS) + || (event->type == GDK_KEY_RELEASE) + || (event->type == GDK_FOCUS_CHANGE))) { + item = canvas->focused_item; + } + + /* The event is propagated up the hierarchy (for if someone connected to + * a group instead of a leaf event), and emission is stopped if a + * handler returns TRUE, just like for GtkWidget events. + */ + + finished = FALSE; + + while (item && !finished) { + g_object_ref(G_OBJECT(item)); + + ganv_item_emit_event(item, ev, &finished); + + parent = item->parent; + g_object_unref(G_OBJECT(item)); + + item = parent; + } + + gdk_event_free(ev); + + return finished; +} + +/* Re-picks the current item in the canvas, based on the event's coordinates. + * Also emits enter/leave events for items as appropriate. + */ +static int +pick_current_item(GanvCanvas* canvas, GdkEvent* event) +{ + int button_down; + double x, y; + int cx, cy; + int retval; + + retval = FALSE; + + /* If a button is down, we'll perform enter and leave events on the + * current item, but not enter on any other item. This is more or less + * like X pointer grabbing for canvas items. + */ + button_down = canvas->state & (GDK_BUTTON1_MASK + | GDK_BUTTON2_MASK + | GDK_BUTTON3_MASK + | GDK_BUTTON4_MASK + | GDK_BUTTON5_MASK); + if (!button_down) { + canvas->left_grabbed_item = FALSE; + } + + /* Save the event in the canvas. This is used to synthesize enter and + * leave events in case the current item changes. It is also used to + * re-pick the current item if the current one gets deleted. Also, + * synthesize an enter event. + */ + if (event != &canvas->pick_event) { + if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE)) { + /* these fields have the same offsets in both types of events */ + + canvas->pick_event.crossing.type = GDK_ENTER_NOTIFY; + canvas->pick_event.crossing.window = event->motion.window; + canvas->pick_event.crossing.send_event = event->motion.send_event; + canvas->pick_event.crossing.subwindow = NULL; + canvas->pick_event.crossing.x = event->motion.x; + canvas->pick_event.crossing.y = event->motion.y; + canvas->pick_event.crossing.mode = GDK_CROSSING_NORMAL; + canvas->pick_event.crossing.detail = GDK_NOTIFY_NONLINEAR; + canvas->pick_event.crossing.focus = FALSE; + canvas->pick_event.crossing.state = event->motion.state; + + /* these fields don't have the same offsets in both types of events */ + + if (event->type == GDK_MOTION_NOTIFY) { + canvas->pick_event.crossing.x_root = event->motion.x_root; + canvas->pick_event.crossing.y_root = event->motion.y_root; + } else { + canvas->pick_event.crossing.x_root = event->button.x_root; + canvas->pick_event.crossing.y_root = event->button.y_root; + } + } else { + canvas->pick_event = *event; + } + } + + /* Don't do anything else if this is a recursive call */ + + if (canvas->in_repick) { + return retval; + } + + /* LeaveNotify means that there is no current item, so we don't look for one */ + + if (canvas->pick_event.type != GDK_LEAVE_NOTIFY) { + /* these fields don't have the same offsets in both types of events */ + + if (canvas->pick_event.type == GDK_ENTER_NOTIFY) { + x = canvas->pick_event.crossing.x - canvas->zoom_xofs; + y = canvas->pick_event.crossing.y - canvas->zoom_yofs; + } else { + x = canvas->pick_event.motion.x - canvas->zoom_xofs; + y = canvas->pick_event.motion.y - canvas->zoom_yofs; + } + + /* canvas pixel coords */ + + cx = (int)(x + 0.5); + cy = (int)(y + 0.5); + + /* world coords */ + + x = canvas->scroll_x1 + x / canvas->pixels_per_unit; + y = canvas->scroll_y1 + y / canvas->pixels_per_unit; + + /* find the closest item */ + + if (canvas->root->object.flags & GANV_ITEM_VISIBLE) { + GANV_ITEM_GET_CLASS(canvas->root)->point( + canvas->root, + x - canvas->root->x, y - canvas->root->y, + cx, cy, + &canvas->new_current_item); + } else { + canvas->new_current_item = NULL; + } + } else { + canvas->new_current_item = NULL; + } + + if ((canvas->new_current_item == canvas->current_item) && !canvas->left_grabbed_item) { + return retval; /* current item did not change */ + + } + /* Synthesize events for old and new current items */ + + if ((canvas->new_current_item != canvas->current_item) + && (canvas->current_item != NULL) + && !canvas->left_grabbed_item) { + GdkEvent new_event; + + new_event = canvas->pick_event; + new_event.type = GDK_LEAVE_NOTIFY; + + new_event.crossing.detail = GDK_NOTIFY_ANCESTOR; + new_event.crossing.subwindow = NULL; + canvas->in_repick = TRUE; + retval = ganv_canvas_emit_event(canvas, &new_event); + canvas->in_repick = FALSE; + } + + /* new_current_item may have been set to NULL during the call to ganv_canvas_emit_event() above */ + + if ((canvas->new_current_item != canvas->current_item) && button_down) { + canvas->left_grabbed_item = TRUE; + return retval; + } + + /* Handle the rest of cases */ + + canvas->left_grabbed_item = FALSE; + canvas->current_item = canvas->new_current_item; + + if (canvas->current_item != NULL) { + GdkEvent new_event; + + new_event = canvas->pick_event; + new_event.type = GDK_ENTER_NOTIFY; + new_event.crossing.detail = GDK_NOTIFY_ANCESTOR; + new_event.crossing.subwindow = NULL; + retval = ganv_canvas_emit_event(canvas, &new_event); + } + + return retval; +} + +/* Button event handler for the canvas */ +static gint +ganv_canvas_button(GtkWidget* widget, GdkEventButton* event) +{ + GanvCanvas* canvas; + int mask; + int retval; + + g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE); + g_return_val_if_fail(event != NULL, FALSE); + + retval = FALSE; + + canvas = GANV_CANVAS(widget); + + /* + * dispatch normally regardless of the event's window if an item has + * has a pointer grab in effect + */ + if (!canvas->grabbed_item && ( event->window != canvas->layout.bin_window) ) { + return retval; + } + + switch (event->button) { + case 1: + mask = GDK_BUTTON1_MASK; + break; + case 2: + mask = GDK_BUTTON2_MASK; + break; + case 3: + mask = GDK_BUTTON3_MASK; + break; + case 4: + mask = GDK_BUTTON4_MASK; + break; + case 5: + mask = GDK_BUTTON5_MASK; + break; + default: + mask = 0; + } + + switch (event->type) { + case GDK_BUTTON_PRESS: + case GDK_2BUTTON_PRESS: + case GDK_3BUTTON_PRESS: + /* Pick the current item as if the button were not pressed, and + * then process the event. + */ + canvas->state = event->state; + pick_current_item(canvas, (GdkEvent*)event); + canvas->state ^= mask; + retval = ganv_canvas_emit_event(canvas, (GdkEvent*)event); + break; + + case GDK_BUTTON_RELEASE: + /* Process the event as if the button were pressed, then repick + * after the button has been released + */ + canvas->state = event->state; + retval = ganv_canvas_emit_event(canvas, (GdkEvent*)event); + event->state ^= mask; + canvas->state = event->state; + pick_current_item(canvas, (GdkEvent*)event); + event->state ^= mask; + break; + + default: + g_assert_not_reached(); + } + + return retval; +} + +/* Motion event handler for the canvas */ +static gint +ganv_canvas_motion(GtkWidget* widget, GdkEventMotion* event) +{ + GanvCanvas* canvas; + + g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE); + g_return_val_if_fail(event != NULL, FALSE); + + canvas = GANV_CANVAS(widget); + + if (event->window != canvas->layout.bin_window) { + return FALSE; + } + + canvas->state = event->state; + pick_current_item(canvas, (GdkEvent*)event); + return ganv_canvas_emit_event(canvas, (GdkEvent*)event); +} + +static gboolean +ganv_canvas_scroll(GtkWidget* widget, GdkEventScroll* event) +{ + GanvCanvas* canvas; + + g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE); + g_return_val_if_fail(event != NULL, FALSE); + + canvas = GANV_CANVAS(widget); + + if (event->window != canvas->layout.bin_window) { + return FALSE; + } + + canvas->state = event->state; + pick_current_item(canvas, (GdkEvent*)event); + return ganv_canvas_emit_event(canvas, (GdkEvent*)event); +} + +/* Key event handler for the canvas */ +static gboolean +ganv_canvas_key(GtkWidget* widget, GdkEventKey* event) +{ + GanvCanvas* canvas; + + g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE); + g_return_val_if_fail(event != NULL, FALSE); + + canvas = GANV_CANVAS(widget); + + if (!ganv_canvas_emit_event(canvas, (GdkEvent*)event)) { + GtkWidgetClass* widget_class; + + widget_class = GTK_WIDGET_CLASS(canvas_parent_class); + + if (event->type == GDK_KEY_PRESS) { + if (widget_class->key_press_event) { + return (*widget_class->key_press_event)(widget, event); + } + } else if (event->type == GDK_KEY_RELEASE) { + if (widget_class->key_release_event) { + return (*widget_class->key_release_event)(widget, event); + } + } else { + g_assert_not_reached(); + } + + return FALSE; + } else { + return TRUE; + } +} + +/* Crossing event handler for the canvas */ +static gint +ganv_canvas_crossing(GtkWidget* widget, GdkEventCrossing* event) +{ + GanvCanvas* canvas; + + g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE); + g_return_val_if_fail(event != NULL, FALSE); + + canvas = GANV_CANVAS(widget); + + if (event->window != canvas->layout.bin_window) { + return FALSE; + } + + canvas->state = event->state; + return pick_current_item(canvas, (GdkEvent*)event); +} + +/* Focus in handler for the canvas */ +static gint +ganv_canvas_focus_in(GtkWidget* widget, GdkEventFocus* event) +{ + GanvCanvas* canvas; + + GTK_WIDGET_SET_FLAGS(widget, GTK_HAS_FOCUS); + + canvas = GANV_CANVAS(widget); + + if (canvas->focused_item) { + return ganv_canvas_emit_event(canvas, (GdkEvent*)event); + } else { + return FALSE; + } +} + +/* Focus out handler for the canvas */ +static gint +ganv_canvas_focus_out(GtkWidget* widget, GdkEventFocus* event) +{ + GanvCanvas* canvas; + + GTK_WIDGET_UNSET_FLAGS(widget, GTK_HAS_FOCUS); + + canvas = GANV_CANVAS(widget); + + if (canvas->focused_item) { + return ganv_canvas_emit_event(canvas, (GdkEvent*)event); + } else { + return FALSE; + } +} + +#define REDRAW_QUANTUM_SIZE 512 + +static void +ganv_canvas_paint_rect(GanvCanvas* canvas, gint x0, gint y0, gint x1, gint y1) +{ + gint draw_x1, draw_y1; + gint draw_x2, draw_y2; + gint draw_width, draw_height; + + g_return_if_fail(!canvas->need_update); + + draw_x1 = MAX(x0, canvas->layout.hadjustment->value - canvas->zoom_xofs); + draw_y1 = MAX(y0, canvas->layout.vadjustment->value - canvas->zoom_yofs); + draw_x2 = MIN(draw_x1 + GTK_WIDGET(canvas)->allocation.width, x1); + draw_y2 = MIN(draw_y1 + GTK_WIDGET(canvas)->allocation.height, y1); + + draw_width = draw_x2 - draw_x1; + draw_height = draw_y2 - draw_y1; + + if ((draw_width < 1) || (draw_height < 1)) { + return; + } + + canvas->redraw_x1 = draw_x1; + canvas->redraw_y1 = draw_y1; + canvas->redraw_x2 = draw_x2; + canvas->redraw_y2 = draw_y2; + canvas->draw_xofs = draw_x1; + canvas->draw_yofs = draw_y1; + + cairo_t* cr = gdk_cairo_create(canvas->layout.bin_window); + + double wx, wy; + ganv_canvas_window_to_world(canvas, 0, 0, &wx, &wy); + cairo_translate(cr, -wx, -wy); + + if (canvas->root->object.flags & GANV_ITEM_VISIBLE) { + (*GANV_ITEM_GET_CLASS(canvas->root)->draw)( + canvas->root, cr, + draw_x1, draw_y1, + draw_width, draw_height); + } + + cairo_destroy(cr); +} + +/* Expose handler for the canvas */ +static gint +ganv_canvas_expose(GtkWidget* widget, GdkEventExpose* event) +{ + GanvCanvas* canvas = GANV_CANVAS(widget); + if (!GTK_WIDGET_DRAWABLE(widget) || + (event->window != canvas->layout.bin_window)) { + return FALSE; + } + + /* Find a single bounding rectangle for all rectangles in the region. + Since drawing the root group is O(n) and thus very expensive for large + canvases, it's much faster to do a single paint than many, even though + more area may be painted that way. With a better group implementation, + it would likely be better to paint each changed rectangle separately. */ + GdkRectangle clip; + gdk_region_get_clipbox(event->region, &clip); + + const int x2 = clip.x + clip.width; + const int y2 = clip.y + clip.height; + + if (canvas->need_update || canvas->need_redraw) { + /* Update or drawing is scheduled, so just mark exposed area as dirty */ + ganv_canvas_request_redraw(canvas, clip.x, clip.y, x2, y2); + } else { + /* No pending updates, draw exposed area immediately */ + ganv_canvas_paint_rect(canvas, clip.x, clip.y, x2, y2); + + /* And call expose on parent container class */ + if (GTK_WIDGET_CLASS(canvas_parent_class)->expose_event) { + (*GTK_WIDGET_CLASS(canvas_parent_class)->expose_event)( + widget, event); + } + } + + return FALSE; +} + +/* Repaints the areas in the canvas that need it */ +static void +paint(GanvCanvas* canvas) +{ + for (GSList* l = canvas->redraw_region; l; l = l->next) { + IRect* rect = (IRect*)l->data; + + const GdkRectangle gdkrect = { + rect->x + canvas->zoom_xofs, + rect->y + canvas->zoom_yofs, + rect->width, + rect->height + }; + + gdk_window_invalidate_rect(canvas->layout.bin_window, &gdkrect, FALSE); + g_free(rect); + } + + g_slist_free(canvas->redraw_region); + canvas->redraw_region = NULL; + canvas->need_redraw = FALSE; + + canvas->redraw_x1 = 0; + canvas->redraw_y1 = 0; + canvas->redraw_x2 = 0; + canvas->redraw_y2 = 0; +} + +static void +do_update(GanvCanvas* canvas) +{ + /* Cause the update if necessary */ + +update_again: + if (canvas->need_update) { + ganv_item_invoke_update(canvas->root, 0); + + canvas->need_update = FALSE; + } + + /* Pick new current item */ + + while (canvas->need_repick) { + canvas->need_repick = FALSE; + pick_current_item(canvas, &canvas->pick_event); + } + + /* it is possible that during picking we emitted an event in which + the user then called some function which then requested update + of something. Without this we'd be left in a state where + need_update would have been left TRUE and the canvas would have + been left unpainted. */ + if (canvas->need_update) { + goto update_again; + } + + /* Paint if able to */ + + if (GTK_WIDGET_DRAWABLE(canvas) && canvas->need_redraw) { + paint(canvas); + } +} + +/* Idle handler for the canvas. It deals with pending updates and redraws. */ +static gboolean +idle_handler(gpointer data) +{ + GanvCanvas* canvas; + + GDK_THREADS_ENTER(); + + canvas = GANV_CANVAS(data); + + do_update(canvas); + + /* Reset idle id */ + canvas->idle_id = 0; + + GDK_THREADS_LEAVE(); + + return FALSE; +} + +/* Convenience function to add an idle handler to a canvas */ +static void +add_idle(GanvCanvas* canvas) +{ + g_assert(canvas->need_update || canvas->need_redraw); + + if (!canvas->idle_id) { + canvas->idle_id = g_idle_add_full(CANVAS_IDLE_PRIORITY, + idle_handler, + canvas, + NULL); + } + + /* canvas->idle_id = gtk_idle_add (idle_handler, canvas); */ +} + +/** + * ganv_canvas_root: + * @canvas: A canvas. + * + * Return value: (transfer none): The root group of the canvas. + */ +GanvItem* +ganv_canvas_root(GanvCanvas* canvas) +{ + g_return_val_if_fail(GANV_IS_CANVAS(canvas), NULL); + + return canvas->root; +} + +/** + * ganv_canvas_set_scroll_region: + * @canvas: A canvas. + * @x1: Leftmost limit of the scrolling region. + * @y1: Upper limit of the scrolling region. + * @x2: Rightmost limit of the scrolling region. + * @y2: Lower limit of the scrolling region. + * + * Sets the scrolling region of a canvas to the specified rectangle. The canvas + * will then be able to scroll only within this region. The view of the canvas + * is adjusted as appropriate to display as much of the new region as possible. + **/ +void +ganv_canvas_set_scroll_region(GanvCanvas* canvas, double x1, double y1, double x2, + double y2) +{ + double wxofs, wyofs; + int xofs, yofs; + + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + /* + * Set the new scrolling region. If possible, do not move the visible contents of the + * canvas. + */ + + ganv_canvas_c2w(canvas, + GTK_LAYOUT(canvas)->hadjustment->value + canvas->zoom_xofs, + GTK_LAYOUT(canvas)->vadjustment->value + canvas->zoom_yofs, + /*canvas->zoom_xofs, + canvas->zoom_yofs,*/ + &wxofs, &wyofs); + + canvas->scroll_x1 = x1; + canvas->scroll_y1 = y1; + canvas->scroll_x2 = x2; + canvas->scroll_y2 = y2; + + ganv_canvas_w2c(canvas, wxofs, wyofs, &xofs, &yofs); + + scroll_to(canvas, xofs, yofs); + + canvas->need_repick = TRUE; +#if 0 + /* todo: should be requesting update */ + (*GANV_ITEM_CLASS(canvas->root->object.klass)->update)( + canvas->root, NULL, NULL, 0); +#endif +} + +/** + * ganv_canvas_get_scroll_region: + * @canvas: A canvas. + * @x1: Leftmost limit of the scrolling region (return value). + * @y1: Upper limit of the scrolling region (return value). + * @x2: Rightmost limit of the scrolling region (return value). + * @y2: Lower limit of the scrolling region (return value). + * + * Queries the scrolling region of a canvas. + **/ +void +ganv_canvas_get_scroll_region(GanvCanvas* canvas, double* x1, double* y1, double* x2, + double* y2) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + if (x1) { + *x1 = canvas->scroll_x1; + } + + if (y1) { + *y1 = canvas->scroll_y1; + } + + if (x2) { + *x2 = canvas->scroll_x2; + } + + if (y2) { + *y2 = canvas->scroll_y2; + } +} + +/** + * ganv_canvas_set_center_scroll_region: + * @canvas: A canvas. + * @center_scroll_region: Whether to center the scrolling region in the canvas + * window when it is smaller than the canvas' allocation. + * + * When the scrolling region of the canvas is smaller than the canvas window, + * e.g. the allocation of the canvas, it can be either centered on the window + * or simply made to be on the upper-left corner on the window. This function + * lets you configure this property. + **/ +void +ganv_canvas_set_center_scroll_region(GanvCanvas* canvas, gboolean center_scroll_region) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + canvas->center_scroll_region = center_scroll_region != 0; + + scroll_to(canvas, + canvas->layout.hadjustment->value, + canvas->layout.vadjustment->value); +} + +/** + * ganv_canvas_get_center_scroll_region: + * @canvas: A canvas. + * + * Returns whether the canvas is set to center the scrolling region in the window + * if the former is smaller than the canvas' allocation. + * + * Return value: Whether the scroll region is being centered in the canvas window. + **/ +gboolean +ganv_canvas_get_center_scroll_region(GanvCanvas* canvas) +{ + g_return_val_if_fail(GANV_IS_CANVAS(canvas), FALSE); + + return canvas->center_scroll_region ? TRUE : FALSE; +} + +/** + * ganv_canvas_set_pixels_per_unit: + * @canvas: A canvas. + * @n: The number of pixels that correspond to one canvas unit. + * + * Sets the zooming factor of a canvas by specifying the number of pixels that + * correspond to one canvas unit. + * + * The anchor point for zooming, i.e. the point that stays fixed and all others + * zoom inwards or outwards from it, depends on whether the canvas is set to + * center the scrolling region or not. You can control this using the + * ganv_canvas_set_center_scroll_region() function. If the canvas is set to + * center the scroll region, then the center of the canvas window is used as the + * anchor point for zooming. Otherwise, the upper-left corner of the canvas + * window is used as the anchor point. + **/ +void +ganv_canvas_set_pixels_per_unit(GanvCanvas* canvas, double n) +{ + double ax, ay; + int x1, y1; + int anchor_x, anchor_y; + + g_return_if_fail(GANV_IS_CANVAS(canvas)); + g_return_if_fail(n > 1e-10); + + if (canvas->center_scroll_region) { + anchor_x = GTK_WIDGET(canvas)->allocation.width / 2; + anchor_y = GTK_WIDGET(canvas)->allocation.height / 2; + } else { + anchor_x = anchor_y = 0; + } + + /* Find the coordinates of the anchor point in units. */ + if (canvas->layout.hadjustment) { + ax + = (canvas->layout.hadjustment->value + + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs; + } else { + ax = (0.0 + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs; + } + if (canvas->layout.hadjustment) { + ay + = (canvas->layout.vadjustment->value + + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs; + } else { + ay = (0.0 + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs; + } + + /* Now calculate the new offset of the upper left corner. */ + x1 = ((ax - canvas->scroll_x1) * n) - anchor_x; + y1 = ((ay - canvas->scroll_y1) * n) - anchor_y; + + canvas->pixels_per_unit = n; + + scroll_to(canvas, x1, y1); + + ganv_canvas_request_update(canvas); + canvas->need_repick = TRUE; +} + +/** + * ganv_canvas_scroll_to: + * @canvas: A canvas. + * @cx: Horizontal scrolling offset in canvas pixel units. + * @cy: Vertical scrolling offset in canvas pixel units. + * + * Makes a canvas scroll to the specified offsets, given in canvas pixel units. + * The canvas will adjust the view so that it is not outside the scrolling + * region. This function is typically not used, as it is better to hook + * scrollbars to the canvas layout's scrolling adjusments. + **/ +void +ganv_canvas_scroll_to(GanvCanvas* canvas, int cx, int cy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + scroll_to(canvas, cx, cy); +} + +/** + * ganv_canvas_get_scroll_offsets: + * @canvas: A canvas. + * @cx: Horizontal scrolling offset (return value). + * @cy: Vertical scrolling offset (return value). + * + * Queries the scrolling offsets of a canvas. The values are returned in canvas + * pixel units. + **/ +void +ganv_canvas_get_scroll_offsets(GanvCanvas* canvas, int* cx, int* cy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + if (cx) { + *cx = canvas->layout.hadjustment->value; + } + + if (cy) { + *cy = canvas->layout.vadjustment->value; + } +} + +/** + * ganv_canvas_get_item_at: + * @canvas: A canvas. + * @x: X position in world coordinates. + * @y: Y position in world coordinates. + * + * Looks for the item that is under the specified position, which must be + * specified in world coordinates. + * + * Return value: (transfer none): The sought item, or NULL if no item is at the + * specified coordinates. + **/ +GanvItem* +ganv_canvas_get_item_at(GanvCanvas* canvas, double x, double y) +{ + GanvItem* item; + double dist; + int cx, cy; + + g_return_val_if_fail(GANV_IS_CANVAS(canvas), NULL); + + ganv_canvas_w2c(canvas, x, y, &cx, &cy); + + dist = GANV_ITEM_GET_CLASS(canvas->root)->point( + canvas->root, + x - canvas->root->x, y - canvas->root->y, + cx, cy, + &item); + if ((int)(dist * canvas->pixels_per_unit + 0.5) <= canvas->close_enough) { + return item; + } else { + return NULL; + } +} + +/* Queues an update of the canvas */ +void +ganv_canvas_request_update(GanvCanvas* canvas) +{ + GANV_CANVAS_GET_CLASS(canvas)->request_update(canvas); +} + +static void +ganv_canvas_request_update_real(GanvCanvas* canvas) +{ + if (canvas->need_update) { + return; + } + + canvas->need_update = TRUE; + if (GTK_WIDGET_MAPPED((GtkWidget*)canvas)) { + add_idle(canvas); + } +} + +static inline gboolean +rect_overlaps(const IRect* a, const IRect* b) +{ + if ((a->x > b->x + b->width) || + (a->y > b->y + b->height) || + (a->x + a->width < b->x) || + (a->y + a->height < b->y)) { + return FALSE; + } + return TRUE; +} + +static inline gboolean +rect_is_visible(GanvCanvas* canvas, const IRect* r) +{ + const IRect rect = { + (int)(canvas->layout.hadjustment->value - canvas->zoom_xofs), + (int)(canvas->layout.vadjustment->value - canvas->zoom_yofs), + GTK_WIDGET(canvas)->allocation.width, + GTK_WIDGET(canvas)->allocation.height + }; + + return rect_overlaps(&rect, r); +} + +/** + * ganv_canvas_request_redraw: + * @canvas: A canvas. + * @x1: Leftmost coordinate of the rectangle to be redrawn. + * @y1: Upper coordinate of the rectangle to be redrawn. + * @x2: Rightmost coordinate of the rectangle to be redrawn, plus 1. + * @y2: Lower coordinate of the rectangle to be redrawn, plus 1. + * + * Informs a canvas that the specified area needs to be repainted. To be used + * only by item implementations. + **/ +void +ganv_canvas_request_redraw(GanvCanvas* canvas, int x1, int y1, int x2, int y2) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + if (!GTK_WIDGET_DRAWABLE(canvas) || (x1 >= x2) || (y1 >= y2)) { + return; + } + + const IRect rect = { x1, y1, x2 - x1, y2 - y1 }; + + if (!rect_is_visible(canvas, &rect)) { + return; + } + + IRect* r = (IRect*)g_malloc(sizeof(IRect)); + *r = rect; + + canvas->redraw_region = g_slist_prepend(canvas->redraw_region, r); + canvas->need_redraw = TRUE; + + if (canvas->idle_id == 0) { + add_idle(canvas); + } +} + +/** + * ganv_canvas_w2c_affine: + * @canvas: A canvas. + * @matrix: An affine transformation matrix (return value). + * + * Gets the affine transform that converts from world coordinates to canvas + * pixel coordinates. + **/ +void +ganv_canvas_w2c_affine(GanvCanvas* canvas, cairo_matrix_t* matrix) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + g_return_if_fail(matrix != NULL); + + cairo_matrix_init_translate(matrix, + -canvas->scroll_x1, + -canvas->scroll_y1); + + cairo_matrix_scale(matrix, + canvas->pixels_per_unit, + canvas->pixels_per_unit); +} + +/** + * ganv_canvas_w2c: + * @canvas: A canvas. + * @wx: World X coordinate. + * @wy: World Y coordinate. + * @cx: X pixel coordinate (return value). + * @cy: Y pixel coordinate (return value). + * + * Converts world coordinates into canvas pixel coordinates. + **/ +void +ganv_canvas_w2c(GanvCanvas* canvas, double wx, double wy, int* cx, int* cy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + cairo_matrix_t matrix; + ganv_canvas_w2c_affine(canvas, &matrix); + + cairo_matrix_transform_point(&matrix, &wx, &wy); + + if (cx) { + *cx = floor(wx + 0.5); + } + if (cy) { + *cy = floor(wy + 0.5); + } +} + +/** + * ganv_canvas_w2c_d: + * @canvas: A canvas. + * @wx: World X coordinate. + * @wy: World Y coordinate. + * @cx: X pixel coordinate (return value). + * @cy: Y pixel coordinate (return value). + * + * Converts world coordinates into canvas pixel coordinates. This + * version returns coordinates in floating point coordinates, for + * greater precision. + **/ +void +ganv_canvas_w2c_d(GanvCanvas* canvas, double wx, double wy, double* cx, double* cy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + cairo_matrix_t matrix; + ganv_canvas_w2c_affine(canvas, &matrix); + + cairo_matrix_transform_point(&matrix, &wx, &wy); + + if (cx) { + *cx = wx; + } + if (cy) { + *cy = wy; + } +} + +/** + * ganv_canvas_c2w: + * @canvas: A canvas. + * @cx: Canvas pixel X coordinate. + * @cy: Canvas pixel Y coordinate. + * @wx: X world coordinate (return value). + * @wy: Y world coordinate (return value). + * + * Converts canvas pixel coordinates to world coordinates. + **/ +void +ganv_canvas_c2w(GanvCanvas* canvas, int cx, int cy, double* wx, double* wy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + cairo_matrix_t matrix; + ganv_canvas_w2c_affine(canvas, &matrix); + cairo_matrix_invert(&matrix); + + double x = cx; + double y = cy; + cairo_matrix_transform_point(&matrix, &x, &y); + + if (wx) { + *wx = x; + } + if (wy) { + *wy = y; + } +} + +/** + * ganv_canvas_window_to_world: + * @canvas: A canvas. + * @winx: Window-relative X coordinate. + * @winy: Window-relative Y coordinate. + * @worldx: X world coordinate (return value). + * @worldy: Y world coordinate (return value). + * + * Converts window-relative coordinates into world coordinates. You can use + * this when you need to convert mouse coordinates into world coordinates, for + * example. + **/ +void +ganv_canvas_window_to_world(GanvCanvas* canvas, double winx, double winy, + double* worldx, double* worldy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + if (worldx) { + *worldx = canvas->scroll_x1 + ((winx - canvas->zoom_xofs) + / canvas->pixels_per_unit); + } + + if (worldy) { + *worldy = canvas->scroll_y1 + ((winy - canvas->zoom_yofs) + / canvas->pixels_per_unit); + } +} + +/** + * ganv_canvas_world_to_window: + * @canvas: A canvas. + * @worldx: World X coordinate. + * @worldy: World Y coordinate. + * @winx: X window-relative coordinate. + * @winy: Y window-relative coordinate. + * + * Converts world coordinates into window-relative coordinates. + **/ +void +ganv_canvas_world_to_window(GanvCanvas* canvas, double worldx, double worldy, + double* winx, double* winy) +{ + g_return_if_fail(GANV_IS_CANVAS(canvas)); + + if (winx) { + *winx = (canvas->pixels_per_unit) * (worldx - canvas->scroll_x1) + canvas->zoom_xofs; + } + + if (winy) { + *winy = (canvas->pixels_per_unit) * (worldy - canvas->scroll_y1) + canvas->zoom_yofs; + } +} + } // extern "C" |