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viewport: Add gtk_viewport_scroll_to()

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First implementation of GtkScrollInfo
This commit is contained in:
Benjamin Otte 2023-03-07 05:33:47 +01:00
parent 105be5a457
commit 2a5f1dc6c7
2 changed files with 58 additions and 0 deletions
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53
gtk/gtkviewport.c
View File

@ -30,11 +30,13 @@
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkscrollable.h"
#include "gtkscrollinfoprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include "gtkbuildable.h"
#include "gtktext.h"
#include <math.h>
/**
* GtkViewport:
@ -720,3 +722,54 @@ gtk_viewport_get_child (GtkViewport *viewport)
return viewport->child;
}
/**
* gtk_viewport_scroll_to:
* @viewport: a `GtkViewport`
* @descendant: a descendant widget of the viewport
* @scroll: (nullable) (transfer full): details of how to perform
* the scroll operation or NULL to scroll into view
*
* Scrolls a descendant of the viewport into view.
*
* The viewport and the descendant must be visible and mapped for
* this function to work, otherwise no scrolling will be performed.
*
* Since: 4.12
**/
void
gtk_viewport_scroll_to (GtkViewport *viewport,
GtkWidget *descendant,
GtkScrollInfo *scroll)
{
graphene_rect_t bounds;
int x, y;
double adj_x, adj_y;
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
g_return_if_fail (GTK_IS_WIDGET (descendant));
if (!gtk_widget_compute_bounds (descendant, GTK_WIDGET (viewport), &bounds))
return;
adj_x = gtk_adjustment_get_value (viewport->adjustment[GTK_ORIENTATION_HORIZONTAL]);
adj_y = gtk_adjustment_get_value (viewport->adjustment[GTK_ORIENTATION_VERTICAL]);
gtk_scroll_info_compute_scroll (scroll,
&(GdkRectangle) {
floor (bounds.origin.x + adj_x),
floor (bounds.origin.y + adj_y),
ceil (bounds.origin.x + bounds.size.width) - floor (bounds.origin.x),
ceil (bounds.origin.y + bounds.size.height) - floor (bounds.origin.y)
},
&(GdkRectangle) {
adj_x,
adj_y,
gtk_widget_get_width (GTK_WIDGET (viewport)),
gtk_widget_get_height (GTK_WIDGET (viewport))
},
&x, &y);
gtk_adjustment_animate_to_value (viewport->adjustment[GTK_ORIENTATION_HORIZONTAL], x);
gtk_adjustment_animate_to_value (viewport->adjustment[GTK_ORIENTATION_VERTICAL], y);
}

5
gtk/gtkviewport.h
View File

@ -61,6 +61,11 @@ void gtk_viewport_set_child (GtkViewport *viewport,
GDK_AVAILABLE_IN_ALL
GtkWidget * gtk_viewport_get_child (GtkViewport *viewport);
GDK_AVAILABLE_IN_4_12
void gtk_viewport_scroll_to (GtkViewport *viewport,
GtkWidget *descendant,
GtkScrollInfo *scroll);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkViewport, g_object_unref)
G_END_DECLS