daleclack
/
My_GtkUi
mirror of https://github.com/daleclack/My_GtkUi
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Add drag for image viewer

This commit is contained in:
daleclack 2024-02-19 21:36:05 +08:00
parent 5cb35ec046
commit ddb97dd4f8
1 changed files with 48 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
Gtk4_Reset/src/image_app/ImageApp.cpp
View File

@ -14,6 +14,10 @@ struct _ImageApp
GtkBuilder *builder;
GtkWidget *image_menu;
// Drag for image position
GtkAdjustment *hadjustment, *vadjustment;
int start_x, start_y;
// Main Image View
MyImage *image_view;
};
@ -86,6 +90,40 @@ static void gesture_pressed(GtkGesture *gesture,
gtk_popover_popup(GTK_POPOVER(app->image_menu));
}
static void drag_update(GtkGesture *gesture, double x, double y, ImageApp *app)
{
// g_print("Draging");
// Get Current position
double curr_x, curr_y, max_x, max_y;
curr_x = gtk_adjustment_get_value(app->hadjustment);
curr_y = gtk_adjustment_get_value(app->vadjustment);
max_x = gtk_adjustment_get_upper(app->hadjustment);
max_y = gtk_adjustment_get_upper(app->vadjustment);
// Calculate position change
curr_x -= x;
curr_y -= y;
if (curr_x > max_x)
{
curr_x = max_x;
}
if (curr_x < 0)
{
curr_x = 0.0;
}
if (curr_y > max_y)
{
curr_y = max_y;
}
if (curr_x < 0)
{
curr_x = 0.0;
}
gtk_adjustment_set_value(app->hadjustment, curr_x);
gtk_adjustment_set_value(app->vadjustment, curr_y);
}
static void image_app_dialog_response(GObject *dialog, GAsyncResult *result, gpointer data)
{
GFile *file;
@ -133,6 +171,8 @@ static void image_app_init(ImageApp *self)
self->image_sw = gtk_scrolled_window_new();
self->image_scale = gtk_scale_new_with_range(GTK_ORIENTATION_HORIZONTAL, 0.1, 10.0, 0.1);
self->btnopen = gtk_button_new_with_label("Open Image");
self->hadjustment = gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(self->image_sw));
self->vadjustment = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(self->image_sw));
g_signal_connect(self->btnopen, "clicked", G_CALLBACK(btnopen_clicked), self);
g_signal_connect(self->image_scale, "change-value", G_CALLBACK(image_app_change_scale), self);
@ -160,6 +200,14 @@ static void image_app_init(ImageApp *self)
gtk_widget_set_parent(self->image_menu, GTK_WIDGET(self->image_view));
gtk_popover_present(GTK_POPOVER(self->image_menu));
// Add drag gesture
self->gesture_drag = gtk_gesture_drag_new();
gtk_gesture_single_set_button(GTK_GESTURE_SINGLE(self->gesture_drag), GDK_BUTTON_PRIMARY);
gtk_widget_add_controller(GTK_WIDGET(self->image_view), GTK_EVENT_CONTROLLER(self->gesture_drag));
// g_signal_connect(self->gesture_drag, "drag-begin", G_CALLBACK(drag_begin), self);
g_signal_connect(self->gesture_drag, "drag-update", G_CALLBACK(drag_update), self);
g_signal_connect(self->gesture_drag, "drag-end", G_CALLBACK(drag_update), self);
// Pack Widgets
gtk_scrolled_window_set_child(GTK_SCROLLED_WINDOW(self->image_sw), GTK_WIDGET(self->image_view));
gtk_box_append(GTK_BOX(self->main_box), self->image_sw);