summaryrefslogtreecommitdiffstats
path: root/src/zoom-context.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/zoom-context.cpp')
-rw-r--r--src/zoom-context.cpp241
1 files changed, 241 insertions, 0 deletions
diff --git a/src/zoom-context.cpp b/src/zoom-context.cpp
new file mode 100644
index 000000000..f7bae09e9
--- /dev/null
+++ b/src/zoom-context.cpp
@@ -0,0 +1,241 @@
+#define __SP_ZOOM_CONTEXT_C__
+
+/*
+ * Handy zooming tool
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Frank Felfe <innerspace@iname.com>
+ * bulia byak <buliabyak@users.sf.net>
+ *
+ * Copyright (C) 1999-2002 Authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+
+#include <gdk/gdkkeysyms.h>
+
+#include "macros.h"
+#include "rubberband.h"
+#include "desktop.h"
+#include "pixmaps/cursor-zoom.xpm"
+#include "pixmaps/cursor-zoom-out.xpm"
+#include "prefs-utils.h"
+
+#include "zoom-context.h"
+
+static void sp_zoom_context_class_init(SPZoomContextClass *klass);
+static void sp_zoom_context_init(SPZoomContext *zoom_context);
+static void sp_zoom_context_setup(SPEventContext *ec);
+static void sp_zoom_context_finish (SPEventContext *ec);
+
+static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event);
+static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
+
+static SPEventContextClass *parent_class;
+
+static gint xp = 0, yp = 0; // where drag started
+static gint tolerance = 0;
+static bool within_tolerance = false;
+static bool escaped;
+
+GType sp_zoom_context_get_type(void)
+{
+ static GType type = 0;
+
+ if (!type) {
+ GTypeInfo info = {
+ sizeof(SPZoomContextClass),
+ NULL, NULL,
+ (GClassInitFunc) sp_zoom_context_class_init,
+ NULL, NULL,
+ sizeof(SPZoomContext),
+ 4,
+ (GInstanceInitFunc) sp_zoom_context_init,
+ NULL, /* value_table */
+ };
+ type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPZoomContext", &info, (GTypeFlags) 0);
+ }
+
+ return type;
+}
+
+static void sp_zoom_context_class_init(SPZoomContextClass *klass)
+{
+ SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
+
+ parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
+
+ event_context_class->setup = sp_zoom_context_setup;
+ event_context_class->finish = sp_zoom_context_finish;
+
+ event_context_class->root_handler = sp_zoom_context_root_handler;
+ event_context_class->item_handler = sp_zoom_context_item_handler;
+}
+
+static void sp_zoom_context_init (SPZoomContext *zoom_context)
+{
+ SPEventContext *event_context = SP_EVENT_CONTEXT(zoom_context);
+
+ event_context->cursor_shape = cursor_zoom_xpm;
+ event_context->hot_x = 6;
+ event_context->hot_y = 6;
+}
+
+static void
+sp_zoom_context_finish (SPEventContext *ec)
+{
+ ec->enableGrDrag(false);
+}
+
+static void sp_zoom_context_setup(SPEventContext *ec)
+{
+ if (prefs_get_int_attribute("tools.zoom", "selcue", 0) != 0) {
+ ec->enableSelectionCue();
+ }
+ if (prefs_get_int_attribute("tools.zoom", "gradientdrag", 0) != 0) {
+ ec->enableGrDrag();
+ }
+
+ if (((SPEventContextClass *) parent_class)->setup) {
+ ((SPEventContextClass *) parent_class)->setup(ec);
+ }
+}
+
+static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
+{
+ gint ret = FALSE;
+
+ if (((SPEventContextClass *) parent_class)->item_handler) {
+ ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);
+ }
+
+ return ret;
+}
+
+static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event)
+{
+ SPDesktop *desktop = event_context->desktop;
+ tolerance = prefs_get_int_attribute_limited ("options.dragtolerance", "value", 0, 0, 100);
+ double const zoom_inc = prefs_get_double_attribute_limited("options.zoomincrement", "value", M_SQRT2, 1.01, 10);
+
+ gint ret = FALSE;
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ if (event->button.button == 1) {
+ // save drag origin
+ xp = (gint) event->button.x;
+ yp = (gint) event->button.y;
+ within_tolerance = true;
+
+ NR::Point const button_w(event->button.x, event->button.y);
+ NR::Point const button_dt(desktop->w2d(button_w));
+ Inkscape::Rubberband::get()->start(desktop, button_dt);
+
+ escaped = false;
+
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ if (event->motion.state & GDK_BUTTON1_MASK) {
+ ret = TRUE;
+
+ if ( within_tolerance
+ && ( abs( (gint) event->motion.x - xp ) < tolerance )
+ && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
+ break; // do not drag if we're within tolerance from origin
+ }
+ // Once the user has moved farther than tolerance from the original location
+ // (indicating they intend to move the object, not click), then always process the
+ // motion notify coordinates as given (no snapping back to origin)
+ within_tolerance = false;
+
+ NR::Point const motion_w(event->motion.x, event->motion.y);
+ NR::Point const motion_dt(desktop->w2d(motion_w));
+ Inkscape::Rubberband::get()->move(motion_dt);
+ }
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ if ( event->button.button == 1 ) {
+ NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
+ if (b != NR::Nothing() && !within_tolerance) {
+ desktop->set_display_area(b.assume(), 10);
+ } else if (!escaped) {
+ NR::Point const button_w(event->button.x, event->button.y);
+ NR::Point const button_dt(desktop->w2d(button_w));
+ double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
+ ? 1 / zoom_inc
+ : zoom_inc );
+ desktop->zoom_relative_keep_point(button_dt, zoom_rel);
+ }
+ ret = TRUE;
+ }
+ Inkscape::Rubberband::get()->stop();
+ xp = yp = 0;
+ escaped = false;
+ break;
+
+ case GDK_KEY_PRESS:
+ switch (get_group0_keyval (&event->key)) {
+ case GDK_Escape:
+ Inkscape::Rubberband::get()->stop();
+ xp = yp = 0;
+ escaped = true;
+ ret = TRUE;
+ break;
+ case GDK_Up:
+ case GDK_Down:
+ case GDK_KP_Up:
+ case GDK_KP_Down:
+ // prevent the zoom field from activation
+ if (!MOD__CTRL_ONLY)
+ ret = TRUE;
+ break;
+ case GDK_Shift_L:
+ case GDK_Shift_R:
+ event_context->cursor_shape = cursor_zoom_out_xpm;
+ sp_event_context_update_cursor(event_context);
+ break;
+ default:
+ break;
+ }
+ break;
+ case GDK_KEY_RELEASE:
+ switch (get_group0_keyval (&event->key)) {
+ case GDK_Shift_L:
+ case GDK_Shift_R:
+ event_context->cursor_shape = cursor_zoom_xpm;
+ sp_event_context_update_cursor(event_context);
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (!ret) {
+ if (((SPEventContextClass *) parent_class)->root_handler) {
+ ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
+ }
+ }
+
+ return ret;
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
generated by cgit v1.2.3 (git 2.25.1) at 2026-05-19 04:23:09 +0000