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Update drag_motion() to scroll the routing window

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The routing window will be scrolled relative to the position of the
mouse within the window so all sources/sinks can be reached when
dragging.
This commit is contained in:
Geoffrey D. Bennett
2023-11-30 00:42:55 +10:30
parent 8376ce70b4
commit 32c0062367
1 changed files with 38 additions and 0 deletions
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38
src/routing-drag-line.c
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@@ -40,6 +40,44 @@ static void drag_motion(
card->drag_x = x;
card->drag_y = y;
// Retrieve the scrolled window and its child
GtkWindow *win = GTK_WINDOW(card->window_routing);
GtkScrolledWindow *sw = GTK_SCROLLED_WINDOW(gtk_window_get_child(win));
GtkWidget *child = gtk_scrolled_window_get_child(sw);
// Get horizontal and vertical adjustments for the scrolled window
GtkAdjustment *hadj = gtk_scrolled_window_get_hadjustment(sw);
GtkAdjustment *vadj = gtk_scrolled_window_get_vadjustment(sw);
// Calculate the total scrollable width and height
double w = gtk_adjustment_get_upper(hadj) -
gtk_adjustment_get_page_size(hadj);
double h = gtk_adjustment_get_upper(vadj) -
gtk_adjustment_get_page_size(vadj);
// Determine the relative size of the scrollable area
double rel_w = gtk_adjustment_get_upper(hadj) - gtk_widget_get_allocated_width(GTK_WIDGET(sw)) + gtk_widget_get_allocated_width(child);
double rel_h = gtk_adjustment_get_upper(vadj) - gtk_widget_get_allocated_height(GTK_WIDGET(sw)) + gtk_widget_get_allocated_height(child);
// Add margin
rel_w -= 100;
rel_h -= 100;
x -= 50;
y -= 50;
if (x < 0) x = 0;
if (y < 0) y = 0;
if (x > rel_w) x = rel_w;
if (y > rel_h) y = rel_h;
// Calculate new scroll positions based on mouse coordinates
double new_hpos = (x / rel_w) * w;
double new_vpos = (y / rel_h) * h;
// Update the scrolled window's position
gtk_adjustment_set_value(vadj, new_vpos);
gtk_adjustment_set_value(hadj, new_hpos);
gtk_widget_queue_draw(card->drag_line);
gtk_widget_queue_draw(card->routing_lines);
}