* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
+#include <config.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
ev_view_set_cursor (view, EV_VIEW_CURSOR_DRAG);
return;
}
+
+ if (view->scroll_info.autoscrolling) {
+ if (view->cursor != EV_VIEW_CURSOR_AUTOSCROLL)
+ ev_view_set_cursor (view, EV_VIEW_CURSOR_AUTOSCROLL);
+ return;
+ }
link = ev_view_get_link_at_location (view, x, y);
switch (event->button) {
case 1: {
+
+ if (view->scroll_info.autoscrolling == TRUE) {
+ view->scroll_info.autoscrolling = FALSE;
+ return TRUE;
+ }
+
EvImage *image;
EvFormField *field;
case 2:
/* use root coordinates as reference point because
* scrolling changes window relative coordinates */
+ if (view->scroll_info.autoscrolling == TRUE) {
+ view->scroll_info.autoscrolling = FALSE;
+ return TRUE;
+ }
view->drag_info.start.x = event->x_root;
view->drag_info.start.y = event->y_root;
view->drag_info.hadj = gtk_adjustment_get_value (view->hadjustment);
return TRUE;
case 3:
+ if (!view->scroll_info.autoscrolling)
+ view->scroll_info.start_y = event->y;
return ev_view_do_popup_menu (view, event->x, event->y);
}
return TRUE;
}
+static gboolean
+ev_view_drag_update_momentum (EvView *view)
+{
+ int i;
+ if (!view->drag_info.in_drag)
+ return FALSE;
+
+ for (i = DRAG_HISTORY - 1; i > 0; i--) {
+ view->drag_info.buffer[i].x = view->drag_info.buffer[i-1].x;
+ view->drag_info.buffer[i].y = view->drag_info.buffer[i-1].y;
+ }
+
+ /* Momentum is a moving average of 10ms granularity over
+ * the last 100ms with each 10ms stored in buffer.
+ */
+
+ view->drag_info.momentum.x = (view->drag_info.buffer[DRAG_HISTORY - 1].x - view->drag_info.buffer[0].x);
+ view->drag_info.momentum.y = (view->drag_info.buffer[DRAG_HISTORY - 1].y - view->drag_info.buffer[0].y);
+
+ return TRUE;
+}
+
+static gboolean
+ev_view_scroll_drag_release (EvView *view)
+{
+ gdouble dhadj_value, dvadj_value;
+ gdouble oldhadjustment, oldvadjustment;
+
+ view->drag_info.momentum.x /= 1.2;
+ view->drag_info.momentum.y /= 1.2; /* Alter these constants to change "friction" */
+
+ dhadj_value = view->hadjustment->page_size *
+ (gdouble)view->drag_info.momentum.x / GTK_WIDGET (view)->allocation.width;
+ dvadj_value = view->vadjustment->page_size *
+ (gdouble)view->drag_info.momentum.y / GTK_WIDGET (view)->allocation.height;
+
+ oldhadjustment = gtk_adjustment_get_value (view->hadjustment);
+ oldvadjustment = gtk_adjustment_get_value (view->vadjustment);
+
+ if (((oldhadjustment + dhadj_value) > (view->hadjustment->upper - view->hadjustment->page_size)) ||
+ ((oldhadjustment + dhadj_value) < 0))
+ view->drag_info.momentum.x *= -0.5; /* 0.5 rather than 1 means the edges absorb some momentum */
+ if (((oldvadjustment + dvadj_value) > (view->vadjustment->upper - view->vadjustment->page_size)) ||
+ ((oldvadjustment + dvadj_value) < 0))
+ view->drag_info.momentum.y *= -0.5;
+
+ gtk_adjustment_set_value (view->hadjustment,
+ MIN (oldhadjustment + dhadj_value,
+ view->hadjustment->upper - view->hadjustment->page_size));
+ gtk_adjustment_set_value (view->vadjustment,
+ MIN (oldvadjustment + dvadj_value,
+ view->vadjustment->upper - view->vadjustment->page_size));
+
+ if (((view->drag_info.momentum.x < 1) && (view->drag_info.momentum.x > -1)) &&
+ ((view->drag_info.momentum.y < 1) && (view->drag_info.momentum.y > -1)))
+ return FALSE;
+ else
+ return TRUE;
+}
+
static gboolean
ev_view_motion_notify_event (GtkWidget *widget,
GdkEventMotion *event)
if (!view->document)
return FALSE;
+
if (event->is_hint || event->window != view->layout.bin_window) {
gtk_widget_get_pointer (widget, &x, &y);
y = event->y;
}
+ if (view->scroll_info.autoscrolling) {
+ view->scroll_info.last_y = y;
+ }
+
if (view->selection_info.in_drag) {
if (gtk_drag_check_threshold (widget,
view->selection_info.start.x,
} else if (view->pressed_button == 2) {
if (!view->drag_info.in_drag) {
gboolean start;
+ int i;
start = gtk_drag_check_threshold (widget,
view->drag_info.start.x,
event->x_root,
event->y_root);
view->drag_info.in_drag = start;
+ view->drag_info.drag_timeout_id = g_timeout_add (10,
+ (GSourceFunc)ev_view_drag_update_momentum, view);
+ /* Set 100 to choose how long it takes to build up momentum */
+ /* Clear out previous momentum info: */
+ for (i = 0; i < DRAG_HISTORY; i++) {
+ view->drag_info.buffer[i].x = event->x;
+ view->drag_info.buffer[i].y = event->y;
+ }
+ view->drag_info.momentum.x = 0;
+ view->drag_info.momentum.y = 0;
}
if (view->drag_info.in_drag) {
int dx, dy;
gdouble dhadj_value, dvadj_value;
+ view->drag_info.buffer[0].x = event->x;
+ view->drag_info.buffer[0].y = event->y;
+
dx = event->x_root - view->drag_info.start.x;
dy = event->y_root - view->drag_info.start.y;
view->drag_info.in_drag = FALSE;
view->image_dnd_info.in_drag = FALSE;
+
+ view->drag_info.release_timeout_id = g_timeout_add (20,
+ (GSourceFunc)ev_view_scroll_drag_release, view);
if (view->pressed_button == 2) {
ev_view_handle_cursor_over_xy (view, event->x, event->y);
view->loading_text = NULL;
}
+ if (view->scroll_info.timeout_id) {
+ g_source_remove (view->scroll_info.timeout_id);
+ view->scroll_info.timeout_id = 0;
+ }
+
+ if (view->drag_info.drag_timeout_id) {
+ g_source_remove (view->drag_info.drag_timeout_id);
+ view->drag_info.drag_timeout_id = 0;
+ }
+
+ if (view->drag_info.release_timeout_id) {
+ g_source_remove (view->drag_info.release_timeout_id);
+ view->drag_info.release_timeout_id = 0;
+ }
+
ev_view_presentation_transition_stop (view);
ev_view_set_scroll_adjustments (GTK_LAYOUT (view), NULL, NULL);
view->pressed_button = -1;
view->cursor = EV_VIEW_CURSOR_NORMAL;
view->drag_info.in_drag = FALSE;
+ view->scroll_info.autoscrolling = FALSE;
view->selection_info.selections = NULL;
view->selection_info.in_selection = FALSE;
view->selection_info.in_drag = FALSE;
gtk_widget_queue_draw (GTK_WIDGET (view));
}
+static gboolean ev_view_autoscroll_cb (EvView *view)
+{
+ gdouble speed, value;
+
+ /* If the user stops autoscrolling, autoscrolling will be
+ * set to false but the timeout will continue; stop the timeout: */
+ if (!view->scroll_info.autoscrolling) {
+ view->scroll_info.timeout_id = 0;
+ return FALSE;
+ }
+
+ if (view->scroll_info.last_y > view->scroll_info.start_y &&
+ (view->scroll_info.last_y < view->scroll_info.start_y))
+ return TRUE;
+
+ /* Replace 100 with your speed of choice: The lower the faster.
+ * Replace 3 with another speed of choice: The higher, the faster it accelerated
+ * based on the distance of the starting point from the mouse
+ * (All also effected by the timeout interval of this callback) */
+
+ if (view->scroll_info.start_y > view->scroll_info.last_y)
+ speed = -pow ((((gdouble)view->scroll_info.start_y - view->scroll_info.last_y) / 100), 3);
+ else
+ speed = pow ((((gdouble)view->scroll_info.last_y - view->scroll_info.start_y) / 100), 3);
+
+ value = gtk_adjustment_get_value (view->vadjustment);
+ value = CLAMP (value + speed, 0, view->vadjustment->upper - view->vadjustment->page_size);
+ gtk_adjustment_set_value (view->vadjustment, value);
+
+ return TRUE;
+
+}
+
+void ev_view_autoscroll(EvView *view)
+{
+ view->scroll_info.autoscrolling = TRUE;
+ view->scroll_info.timeout_id = g_timeout_add (20, (GSourceFunc)(ev_view_autoscroll_cb), view);
+}
+
void
ev_view_set_document (EvView *view,
EvDocument *document)
else
scale = factor;
- scale = CLAMP (scale, view->min_scale, view->max_scale);
+ scale = CLAMP (scale,
+ view->sizing_mode == EV_SIZING_FREE ? view->min_scale : 0,
+ view->max_scale);
if (ABS (view->scale - scale) < EPSILON)
return;
case EV_VIEW_CURSOR_DRAG:
cursor = gdk_cursor_new_for_display (display, GDK_FLEUR);
break;
+ case EV_VIEW_CURSOR_AUTOSCROLL:
+ cursor = gdk_cursor_new_for_display (display, GDK_DOUBLE_ARROW);
+ break;
}
if (cursor) {
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