add zooming.

[evince.git] / shell / ev-view.c

diff --git a/shell/ev-view.c b/shell/ev-view.c
index a928ed3033e22a485304fb02a2ddfb750510f7d0..78a75d99e8889d2df17bb6fa42d46031cc4a35cc 100644 (file)
--- a/shell/ev-view.c
+++ b/shell/ev-view.c
@@ -41,6 +41,8 @@ struct _EvView {
        GtkAdjustment *vadjustment;
 
         GArray *find_results;
+
+       double scale;
 };
 
 struct _EvViewClass {
@@ -457,6 +459,8 @@ static void
 ev_view_init (EvView *view)
 {
        static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
+
+       view->scale = 1.0;
        
        gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 
@@ -552,3 +556,84 @@ ev_view_get_page (EvView *view)
        else
                return 1;
 }
+
+#define ZOOM_IN_FACTOR  1.2
+#define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
+
+#define MIN_SCALE 0.05409
+#define MAX_SCALE 18.4884
+
+static void
+ev_view_zoom (EvView   *view,
+             double    factor,
+             gboolean  relative)
+{
+       double scale;
+
+       if (relative)
+               scale = view->scale * factor;
+       else
+               scale = factor;
+
+       view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
+
+       ev_document_set_scale (view->document, view->scale);
+
+       gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+ev_view_zoom_in (EvView *view)
+{
+       ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
+}
+
+void
+ev_view_zoom_out (EvView *view)
+{
+       ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
+}
+
+void
+ev_view_normal_size (EvView *view)
+{
+       ev_view_zoom (view, 1.0, FALSE);
+}
+
+void
+ev_view_best_fit (EvView *view)
+{
+       double scale;
+       int width, height;
+
+       width = height = 0;
+       ev_document_get_page_size (view->document, &width, &height);
+
+       scale = 1.0;
+       if (width != 0 && height != 0) {
+               double scale_w, scale_h;
+
+               scale_w = (double)GTK_WIDGET (view)->allocation.width / width;
+               scale_h = (double)GTK_WIDGET (view)->allocation.height / height;
+
+               scale = (scale_w < scale_h) ? scale_w : scale_h;
+       }
+
+       ev_view_zoom (view, scale, FALSE);
+}
+
+void
+ev_view_fit_width (EvView *view)
+{
+       double scale = 1.0;
+       int width;
+
+       width = 0;
+       ev_document_get_page_size (view->document, &width, NULL);
+
+       scale = 1.0;
+       if (width != 0)
+               scale = (double)GTK_WIDGET (view)->allocation.width / width;
+
+       ev_view_zoom (view, scale, FALSE);
+}