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Implement zooming in LdWindowMain.

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Add convenience methods to LdCanvas.
This commit is contained in:
Přemysl Eric Janouch
2011-02-04 20:19:01 +01:00
parent 6e8839d485
commit 2b0672a2cb
3 changed files with 105 additions and 10 deletions
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60
liblogdiag/ld-canvas.c
View File

@@ -33,8 +33,8 @@
#define ZOOM_MIN 0.01
#define ZOOM_MAX 100
#define ZOOM_DEFAULT 1
/* Multiplication factor for zooming with mouse wheel. */
#define ZOOM_WHEEL_STEP 1.4
/* Multiplication factor for zooming. */
#define ZOOM_STEP 1.4
/* When drawing is requested, extend all sides of
* the rectangle to be drawn by this number of pixels.
@@ -862,6 +862,58 @@ ld_canvas_set_zoom (LdCanvas *self, gdouble zoom)
g_object_notify (G_OBJECT (self), "zoom");
}
/**
* ld_canvas_can_zoom_in:
* @self: an #LdCanvas object.
*
* Return value: %TRUE if the view can be zoomed in.
*/
gboolean
ld_canvas_can_zoom_in (LdCanvas *self)
{
g_return_val_if_fail (LD_IS_CANVAS (self), FALSE);
return self->priv->zoom < ZOOM_MAX;
}
/**
* ld_canvas_can_zoom_out:
* @self: an #LdCanvas object.
*
* Return value: %TRUE if the view can be zoomed out.
*/
gboolean
ld_canvas_can_zoom_out (LdCanvas *self)
{
g_return_val_if_fail (LD_IS_CANVAS (self), FALSE);
return self->priv->zoom > ZOOM_MIN;
}
/**
* ld_canvas_zoom_in:
* @self: an #LdCanvas object.
*
* Zoom the view in.
*/
void
ld_canvas_zoom_in (LdCanvas *self)
{
g_return_if_fail (LD_IS_CANVAS (self));
ld_canvas_set_zoom (self, self->priv->zoom * ZOOM_STEP);
}
/**
* ld_canvas_zoom_out:
* @self: an #LdCanvas object.
*
* Zoom the view out.
*/
void
ld_canvas_zoom_out (LdCanvas *self)
{
g_return_if_fail (LD_IS_CANVAS (self));
ld_canvas_set_zoom (self, self->priv->zoom / ZOOM_STEP);
}
/* ===== Operations ======================================================== */
@@ -1288,10 +1340,10 @@ on_scroll (GtkWidget *widget, GdkEventScroll *event, gpointer user_data)
switch (event->direction)
{
case GDK_SCROLL_UP:
ld_canvas_set_zoom (self, self->priv->zoom * ZOOM_WHEEL_STEP);
ld_canvas_zoom_in (self);
break;
case GDK_SCROLL_DOWN:
ld_canvas_set_zoom (self, self->priv->zoom / ZOOM_WHEEL_STEP);
ld_canvas_zoom_out (self);
break;
default:
return FALSE;

4
liblogdiag/ld-canvas.h
View File

@@ -80,6 +80,10 @@ void ld_canvas_diagram_to_widget_coords (LdCanvas *self,
gdouble ld_canvas_get_zoom (LdCanvas *self);
void ld_canvas_set_zoom (LdCanvas *self, gdouble zoom);
gboolean ld_canvas_can_zoom_in (LdCanvas *self);
void ld_canvas_zoom_in (LdCanvas *self);
gboolean ld_canvas_can_zoom_out (LdCanvas *self);
void ld_canvas_zoom_out (LdCanvas *self);
void ld_canvas_add_object_begin (LdCanvas *self, LdDiagramObject *object);