111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
// SPDX-FileCopyrightText: 2022-2024 Geoffrey D. Bennett <g@b4.vu>
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// SPDX-License-Identifier: GPL-3.0-or-later
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#include "routing-drag-line.h"
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#include "routing-lines.h"
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static void drag_enter(
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GtkDropControllerMotion *motion,
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gdouble x,
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gdouble y,
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gpointer data
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) {
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struct alsa_card *card = data;
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card->drag_x = x;
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card->drag_y = y;
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gtk_widget_queue_draw(card->drag_line);
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gtk_widget_queue_draw(card->routing_lines);
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}
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static void drag_leave(
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GtkDropControllerMotion *motion,
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gpointer data
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) {
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struct alsa_card *card = data;
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card->drag_x = -1;
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card->drag_y = -1;
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gtk_widget_queue_draw(card->drag_line);
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gtk_widget_queue_draw(card->routing_lines);
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}
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static void drag_motion(
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GtkDropControllerMotion *motion,
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gdouble x,
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gdouble y,
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gpointer data
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) {
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struct alsa_card *card = data;
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card->drag_x = x;
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card->drag_y = y;
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// Retrieve the scrolled window and its child
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GtkWindow *win = GTK_WINDOW(card->window_routing);
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GtkScrolledWindow *sw = GTK_SCROLLED_WINDOW(gtk_window_get_child(win));
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GtkWidget *child = gtk_scrolled_window_get_child(sw);
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// Get horizontal and vertical adjustments for the scrolled window
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GtkAdjustment *hadj = gtk_scrolled_window_get_hadjustment(sw);
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GtkAdjustment *vadj = gtk_scrolled_window_get_vadjustment(sw);
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// Calculate the total scrollable width and height
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double w = gtk_adjustment_get_upper(hadj) -
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gtk_adjustment_get_page_size(hadj);
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double h = gtk_adjustment_get_upper(vadj) -
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gtk_adjustment_get_page_size(vadj);
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// Determine the relative size of the scrollable area
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double rel_w = gtk_adjustment_get_upper(hadj) -
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gtk_widget_get_allocated_width(GTK_WIDGET(sw)) +
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gtk_widget_get_allocated_width(child);
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double rel_h = gtk_adjustment_get_upper(vadj) -
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gtk_widget_get_allocated_height(GTK_WIDGET(sw)) +
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gtk_widget_get_allocated_height(child);
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// Add margin
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rel_w -= 100;
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rel_h -= 100;
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x -= 50;
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y -= 50;
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if (x < 0) x = 0;
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if (y < 0) y = 0;
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if (x > rel_w) x = rel_w;
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if (y > rel_h) y = rel_h;
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// Calculate new scroll positions based on mouse coordinates
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double new_hpos = (x / rel_w) * w;
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double new_vpos = (y / rel_h) * h;
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// Update the scrolled window's position
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gtk_adjustment_set_value(vadj, new_vpos);
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gtk_adjustment_set_value(hadj, new_hpos);
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gtk_widget_queue_draw(card->drag_line);
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gtk_widget_queue_draw(card->routing_lines);
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}
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void add_drop_controller_motion(
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struct alsa_card *card,
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GtkWidget *routing_overlay
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) {
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// create an area to draw the drag line on
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card->drag_line = gtk_drawing_area_new();
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gtk_widget_set_can_target(card->drag_line, FALSE);
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gtk_drawing_area_set_draw_func(
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GTK_DRAWING_AREA(card->drag_line), draw_drag_line, card, NULL
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);
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gtk_overlay_add_overlay(
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GTK_OVERLAY(routing_overlay), card->drag_line
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);
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// create a controller to handle the dragging
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GtkEventController *controller = gtk_drop_controller_motion_new();
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g_signal_connect(controller, "enter", G_CALLBACK(drag_enter), card);
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g_signal_connect(controller, "leave", G_CALLBACK(drag_leave), card);
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g_signal_connect(controller, "motion", G_CALLBACK(drag_motion), card);
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gtk_widget_add_controller(card->routing_grid, controller);
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}
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