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treeexpander: Auto-expand during DND

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When hovering over a tree expander during DND,
expand the tree after a timeout. This matches
the behavior of GtkTreeView and GtkExpander.
This commit is contained in:
Matthias Clasen 2020-06-19 14:15:05 -04:00
parent 5629ac3c63
commit 9555e611e1
1 changed files with 59 additions and 0 deletions
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59
gtk/gtktreeexpander.c
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@ -23,6 +23,7 @@
#include "gtkboxlayout.h"
#include "gtkbuiltiniconprivate.h"
#include "gtkdropcontrollermotion.h"
#include "gtkgestureclick.h"
#include "gtkintl.h"
#include "gtktreelistmodel.h"
@ -75,6 +76,8 @@ struct _GtkTreeExpander
GtkWidget *expander;
guint notify_handler;
guint expand_timer;
};
enum
@ -295,6 +298,12 @@ gtk_tree_expander_dispose (GObject *object)
{
GtkTreeExpander *self = GTK_TREE_EXPANDER (object);
if (self->expand_timer)
{
g_source_remove (self->expand_timer);
self->expand_timer = 0;
}
gtk_tree_expander_clear_list_row (self);
gtk_tree_expander_update_for_list_row (self);
@ -557,10 +566,60 @@ gtk_tree_expander_class_init (GtkTreeExpanderClass *klass)
gtk_widget_class_set_css_name (widget_class, I_("treeexpander"));
}
static gboolean
gtk_tree_expander_expand_timeout (gpointer data)
{
GtkTreeExpander *self = GTK_TREE_EXPANDER (data);
if (self->list_row != NULL)
gtk_tree_list_row_set_expanded (self->list_row, TRUE);
self->expand_timer = 0;
return G_SOURCE_REMOVE;
}
#define TIMEOUT_EXPAND 500
static void
gtk_tree_expander_drag_enter (GtkDropControllerMotion *motion,
double x,
double y,
GtkTreeExpander *self)
{
if (self->list_row == NULL)
return;
if (!gtk_tree_list_row_get_expanded (self->list_row) &&
!self->expand_timer)
{
self->expand_timer = g_timeout_add (TIMEOUT_EXPAND, (GSourceFunc) gtk_tree_expander_expand_timeout, self);
g_source_set_name_by_id (self->expand_timer, "[gtk] gtk_tree_expander_expand_timeout");
}
}
static void
gtk_tree_expander_drag_leave (GtkDropControllerMotion *motion,
GtkTreeExpander *self)
{
if (self->expand_timer)
{
g_source_remove (self->expand_timer);
self->expand_timer = 0;
}
}
static void
gtk_tree_expander_init (GtkTreeExpander *self)
{
GtkEventController *controller;
gtk_widget_set_can_focus (GTK_WIDGET (self), TRUE);
controller = gtk_drop_controller_motion_new ();
g_signal_connect (controller, "enter", G_CALLBACK (gtk_tree_expander_drag_enter), self);
g_signal_connect (controller, "leave", G_CALLBACK (gtk_tree_expander_drag_leave), self);
gtk_widget_add_controller (GTK_WIDGET (self), controller);
}
/**