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columnview: Autoscroll during DND

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Use a drop motion controller to autoscroll horizontally
while a drag operation is hovering over the list. The
vertical scrolling is handled by the listview.
This commit is contained in:
Matthias Clasen 2020-06-19 12:22:25 -04:00
parent b299d62a73
commit 470a1aabdd
1 changed files with 29 additions and 0 deletions
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29
gtk/gtkcolumnview.c
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@ -28,6 +28,7 @@
#include "gtkcolumnviewlayoutprivate.h"
#include "gtkcolumnviewsorterprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkdropcontrollermotion.h"
#include "gtkintl.h"
#include "gtklistview.h"
#include "gtkmain.h"
@ -1102,6 +1103,29 @@ header_key_pressed (GtkEventControllerKey *controller,
return FALSE;
}
static void
gtk_column_view_drag_motion (GtkDropControllerMotion *motion,
double x,
double y,
gpointer unused)
{
GtkWidget *widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (motion));
GtkColumnView *self = GTK_COLUMN_VIEW (widget);
double hx, hy;
gtk_widget_translate_coordinates (widget, self->header, x, 0, &hx, &hy);
update_autoscroll (GTK_COLUMN_VIEW (widget), hx);
}
static void
gtk_column_view_drag_leave (GtkDropControllerMotion *motion,
gpointer unused)
{
GtkWidget *widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (motion));
remove_autoscroll (GTK_COLUMN_VIEW (widget));
}
static void
gtk_column_view_init (GtkColumnView *self)
{
@ -1130,6 +1154,11 @@ gtk_column_view_init (GtkColumnView *self)
g_signal_connect (controller, "key-pressed", G_CALLBACK (header_key_pressed), self);
gtk_widget_add_controller (GTK_WIDGET (self), controller);
controller = gtk_drop_controller_motion_new ();
g_signal_connect (controller, "motion", G_CALLBACK (gtk_column_view_drag_motion), NULL);
g_signal_connect (controller, "leave", G_CALLBACK (gtk_column_view_drag_leave), NULL);
gtk_widget_add_controller (GTK_WIDGET (self), controller);
self->sorter = gtk_column_view_sorter_new ();
self->factory = gtk_column_list_item_factory_new (self);
self->listview = GTK_LIST_VIEW (gtk_list_view_new_with_factory (