[gtk+/wip/baedert/gtkimageview: 158/279] GtkImageView: Implement zoom-to-cursor
- From: Timm Bäder <baedert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/baedert/gtkimageview: 158/279] GtkImageView: Implement zoom-to-cursor
- Date: Fri, 1 Apr 2016 09:27:36 +0000 (UTC)
commit 7253d7956a5bc618ecb21b2c1580d7eca197064c
Author: Timm Bäder <mail baedert org>
Date: Sun Aug 9 19:15:53 2015 +0200
GtkImageView: Implement zoom-to-cursor
gtk/gtkimageview.c | 246 +++++++++++++++++++++++++++++-----------------------
1 files changed, 137 insertions(+), 109 deletions(-)
---
diff --git a/gtk/gtkimageview.c b/gtk/gtkimageview.c
index de89d43..07ac5ba 100644
--- a/gtk/gtkimageview.c
+++ b/gtk/gtkimageview.c
@@ -16,13 +16,6 @@
#include <cairo-gobject.h>
#include <math.h>
-int _old_x;
-int _old_y;
-
-int _new_x;
-int _new_y;
-
-
#define DEG_TO_RAD(x) (((x) / 360.0) * (2 * M_PI))
#define RAD_TO_DEG(x) ((x / (2.0 * M_PI) * 360.0))
@@ -42,6 +35,8 @@ struct _GtkImageViewPrivate
GtkGesture *rotate_gesture;
GtkGesture *zoom_gesture;
+ GdkWindow *event_window;
+
/* GtkScrollable stuff */
GtkAdjustment *hadjustment;
GtkAdjustment *vadjustment;
@@ -114,12 +109,55 @@ free_load_task_data (LoadTaskData *data)
}
static void
+gtk_image_view_fix_point (GtkImageView *image_view,
+ double scale_before,
+ int x_before,
+ int y_before)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
+ double x_after;
+ double y_after;
+ double x_value;
+ double y_value;
+
+ g_assert (!(priv->hadjustment == NULL && priv->vadjustment == NULL));
+
+ x_value = gtk_adjustment_get_value (priv->hadjustment);
+ y_value = gtk_adjustment_get_value (priv->vadjustment);
+
+ x_before += x_value;
+ y_before += y_value;
+
+
+ x_after = x_before / scale_before * priv->scale;
+ y_after = y_before / scale_before * priv->scale;
+
+ double x_diff = x_after - x_before;
+ double y_diff = y_after - y_before;
+
+ gtk_adjustment_set_value (priv->hadjustment,
+ x_value + x_diff);
+ gtk_adjustment_set_value (priv->vadjustment,
+ y_value + y_diff);
+}
+
+static void
gesture_angle_changed_cb (GtkGestureRotate *gesture,
double angle,
double delta,
GtkWidget *widget)
{
g_message ("Angle changed. Angle: %f, delta: %f", angle, delta);
+
+ double new_angle = RAD_TO_DEG (DEG_TO_RAD (gtk_image_view_get_angle ((GtkImageView *)widget)) + delta);
+
+
+ g_message ("New angle: %f", new_angle);
+
+ gtk_image_view_set_angle ((GtkImageView *)widget,
+ new_angle);
+
+ gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
}
static void
@@ -127,7 +165,23 @@ gesture_zoom_changed_cb (GtkGestureZoom *gesture,
double zoom,
GtkWidget *widget)
{
+ return;
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private ((GtkImageView *)widget);
g_message ("Zoom changed. Zoom: %f", zoom);
+ double bb_x;
+ double bb_y;
+ double old_scale = priv->scale;
+
+ gtk_gesture_get_bounding_box_center ((GtkGesture *)gesture, &bb_x, &bb_y);
+
+ gtk_image_view_set_scale ((GtkImageView *)widget,
+ old_scale + gtk_gesture_zoom_get_scale_delta (gesture));
+
+ if (priv->hadjustment || priv->vadjustment)
+ gtk_image_view_fix_point ((GtkImageView *)widget,
+ old_scale,
+ bb_x,
+ bb_y);
}
@@ -137,6 +191,9 @@ gtk_image_view_init (GtkImageView *image_view)
GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
GtkStyleContext *sc = gtk_widget_get_style_context ((GtkWidget *)image_view);
+ gtk_widget_set_can_focus ((GtkWidget *)image_view, TRUE);
+ gtk_widget_set_has_window ((GtkWidget *)image_view, FALSE);
+
priv->scale = 1.0;
priv->angle = 0.0;
priv->snap_angle = FALSE;
@@ -145,9 +202,11 @@ gtk_image_view_init (GtkImageView *image_view)
priv->rotate_gesture_enabled = TRUE;
priv->zoom_gesture_enabled = TRUE;
priv->rotate_gesture = gtk_gesture_rotate_new ((GtkWidget *)image_view);
- g_signal_connect (priv->rotate_gesture, "angle-changed", (GCallback)gesture_angle_changed_cb, NULL);
+ gtk_event_controller_set_propagation_phase ((GtkEventController *)priv->rotate_gesture,
+ GTK_PHASE_CAPTURE);
+ g_signal_connect (priv->rotate_gesture, "angle-changed", (GCallback)gesture_angle_changed_cb, image_view);
priv->zoom_gesture = gtk_gesture_zoom_new ((GtkWidget *)image_view);
- g_signal_connect (priv->zoom_gesture, "scale-changed", (GCallback)gesture_zoom_changed_cb, NULL);
+ g_signal_connect (priv->zoom_gesture, "scale-changed", (GCallback)gesture_zoom_changed_cb, image_view);
gtk_style_context_add_class (sc, "image-view");
}
@@ -390,8 +449,6 @@ gtk_image_view_restrict_adjustment (GtkAdjustment *adjustment)
gtk_adjustment_set_value (adjustment, upper - page_size);
else if (value < 0)
gtk_adjustment_set_value (adjustment, 0);
-
-
}
static void
@@ -401,6 +458,7 @@ gtk_image_view_update_adjustments (GtkImageView *image_view)
int widget_width = gtk_widget_get_allocated_width ((GtkWidget *)image_view);
int widget_height = gtk_widget_get_allocated_height ((GtkWidget *)image_view);
+
if (!priv->hadjustment && !priv->vadjustment)
return;
@@ -531,24 +589,6 @@ gtk_image_view_draw (GtkWidget *widget, cairo_t *ct)
cairo_fill (ct);
cairo_restore (ct);
-
-
-
-#if 1
- /*g_message ("old_x: %d,old_y: %d", _old_x, _old_y);*/
- cairo_set_source_rgba (ct, 1, 0, 0, 1);
- cairo_rectangle (ct, _old_x - 2, _old_y - 2, 4, 4);
- cairo_fill (ct);
-
- cairo_set_source_rgba (ct, 0, 0, 1, 1);
- cairo_rectangle (ct, _new_x - 2, _new_y - 2, 4, 4);
- cairo_fill (ct);
-#endif
-
-
-
-
-
return GDK_EVENT_PROPAGATE;
}
@@ -654,67 +694,6 @@ gtk_image_view_set_vscroll_policy (GtkImageView *image_view,
}
-static void
-gtk_image_view_fix_point (GtkImageView *image_view,
- double scale_before,
- int x_before,
- int y_before)
-{
- GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
- double x_after;
- double y_after;
- double x_value;
- double y_value;
- double scale_diff = priv->scale - scale_before;
-
- g_assert (!(priv->hadjustment == NULL && priv->vadjustment == NULL));
-
-
- x_value = gtk_adjustment_get_value (priv->hadjustment);
- y_value = gtk_adjustment_get_value (priv->vadjustment);
-
-
-
- /*x_after = (x_value + x_before) * (1 + scale_diff);*/
- /*y_after = (y_value + y_before) * (1 + scale_diff);*/
-
-
- x_after = (x_before) * (1 + scale_diff);
- y_after = (y_before) * (1 + scale_diff);
-
-
- double x_diff = x_after - (x_before);
- double y_diff = y_after - (y_before);
-
- g_message ("x_diff: %f", x_diff);
- gtk_adjustment_set_value (priv->hadjustment,
- x_value + x_diff);
- gtk_adjustment_set_value (priv->vadjustment,
- y_value + y_diff);
- /*gtk_adjustment_set_value (priv->hadjustment,*/
- /*x_value + x_diff);*/
-
- /*gtk_adjustment_set_value (priv->vadjustment,*/
- /*gtk_adjustment_get_value (priv->vadjustment) + y_diff);*/
-
-
- gtk_widget_queue_draw ((GtkWidget *)image_view);
-
-
-#if 0
- _old_x = x_before - gtk_adjustment_get_value (priv->hadjustment);
- _old_y = y_before - gtk_adjustment_get_value (priv->vadjustment);
-
-
- _new_x = x_after - gtk_adjustment_get_value (priv->hadjustment);
- _new_y = y_after - gtk_adjustment_get_value (priv->vadjustment);
-
- gtk_widget_queue_draw ((GtkWidget *)image_view);
-
-#endif
-}
-
-
/**
* gtk_image_view_set_scale:
* @image_view: A #GtkImageView instance
@@ -963,6 +942,7 @@ gtk_image_view_get_zoom_gesture_enabled (GtkImageView *image_view)
static void
gtk_image_view_realize (GtkWidget *widget)
{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private ((GtkImageView *)widget);
GtkAllocation allocation;
GdkWindowAttr attributes = { 0, };
GdkWindow *window;
@@ -981,12 +961,21 @@ gtk_image_view_realize (GtkWidget *widget)
GDK_BUTTON_RELEASE_MASK |
GDK_SMOOTH_SCROLL_MASK |
GDK_SCROLL_MASK;
- attributes.wclass = GDK_INPUT_OUTPUT;
+ attributes.event_mask = GDK_ALL_EVENTS_MASK;
+ attributes.wclass = GDK_INPUT_ONLY;
+
+ window = gtk_widget_get_parent_window (widget);
+
+ gtk_widget_set_window (widget, window);
+ g_object_ref ((GObject *)window);
window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, GDK_WA_X | GDK_WA_Y);
- gdk_window_set_user_data (window, (GObject *) widget);
- gtk_widget_set_window (widget, window); /* Passes ownership */
+ /*gdk_window_set_user_data (window, (GObject *) widget);*/
+ priv->event_window = window;
+
+ gtk_widget_register_window (widget, priv->event_window);
+ /*gtk_widget_set_window (widget, window); [> Passes ownership <]*/
}
static void
@@ -994,12 +983,13 @@ gtk_image_view_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkImageView *image_view = (GtkImageView *)widget;
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
gtk_widget_set_allocation (widget, allocation);
if (gtk_widget_get_realized (widget))
{
- gdk_window_move_resize (gtk_widget_get_window (widget),
+ gdk_window_move_resize (priv->event_window,
allocation->x, allocation->y,
allocation->width, allocation->height);
}
@@ -1015,6 +1005,9 @@ gtk_image_view_map (GtkWidget *widget)
if (priv->is_animation)
gtk_image_view_start_animation ((GtkImageView *)widget);
+ if (priv->event_window)
+ gdk_window_show (priv->event_window);
+
GTK_WIDGET_CLASS (gtk_image_view_parent_class)->map (widget);
}
@@ -1094,33 +1087,66 @@ gtk_image_view_get_preferred_width (GtkWidget *widget,
}
+int m_x = 0;
+int m_y = 0;
+
static gboolean
-gtk_image_view_scroll_event (GtkWidget *widget,
- GdkEventScroll *event)
+gtk_image_view_motion (GtkWidget *widget,
+ GdkEventMotion *event,
+ gpointer user_data)
+{
+ m_x = event->x;
+ m_y = event->y;
+
+ return TRUE;
+}
+
+static gboolean
+gtk_image_view_key_press_event (GtkWidget *widget,
+ GdkEventKey *event,
+ gpointer user_data)
{
GtkImageView *image_view = (GtkImageView *)widget;
GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
- int x = event->x;
- int y = event->y;
- double old_scale = priv->scale;
- double new_scale = priv->scale - (0.1 * event->delta_y);
+ if (event->keyval == 109)
+ {
+ double old_scale = priv->scale;
+ double new_scale = priv->scale + 0.05;
- gtk_image_view_set_scale (image_view, new_scale);
- /*if (priv->hadjustment)*/
- /*x += gtk_adjustment_get_value (priv->hadjustment);*/
+ gtk_image_view_set_scale (image_view, new_scale);
- /*if (priv->vadjustment)*/
- /*y += gtk_adjustment_get_value (priv->vadjustment);*/
+ if (priv->hadjustment || priv->vadjustment)
+ gtk_image_view_fix_point (image_view,
+ old_scale,
+ m_x,
+ m_y);
+ return TRUE;
+ }
+ return FALSE;
+}
- /*x += gtk_adjustment_get_value (priv->hadjustment);*/
- /*y += gtk_adjustment_get_value (priv->vadjustment);*/
+static gboolean
+gtk_image_view_scroll_event (GtkWidget *widget,
+ GdkEventScroll *event)
+{
+ /*GtkImageView *image_view = (GtkImageView *)widget;*/
+ /*GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);*/
+ /*double old_scale = priv->scale;*/
+ /*double delta = MAX (event->delta_x, event->delta_y);*/
+ /*double new_scale = priv->scale - (0.1 * event->delta_y);*/
- if (priv->hadjustment || priv->vadjustment)
- gtk_image_view_fix_point (image_view, old_scale, x, y);
+
+ /*gtk_image_view_set_scale (image_view, new_scale);*/
+
+ /*if (priv->hadjustment || priv->vadjustment)*/
+ /*gtk_image_view_fix_point (image_view,*/
+ /*old_scale,*/
+ /*event->x,*/
+ /*event->y);*/
return GDK_EVENT_STOP;
@@ -1249,6 +1275,8 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
widget_class->map = gtk_image_view_map;
widget_class->unmap = gtk_image_view_unmap;
widget_class->scroll_event = gtk_image_view_scroll_event;
+ widget_class->motion_notify_event = gtk_image_view_motion;
+ widget_class->key_press_event = gtk_image_view_key_press_event;
widget_class->get_preferred_width = gtk_image_view_get_preferred_width;
widget_class->get_preferred_height = gtk_image_view_get_preferred_height;
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