232 lines
7.2 KiB
C
232 lines
7.2 KiB
C
/*
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* GDSII-Converter
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* Copyright (C) 2019 Mario Hüttel <mario.huettel@gmx.net>
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*
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* This file is part of GDSII-Converter.
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*
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* GDSII-Converter is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* GDSII-Converter is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GDSII-Converter. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Original Drag and Drop Code taken from:
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* https://gitlab.gnome.org/GNOME/gtk/blob/gtk-3-22/tests/testlist3.c
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*/
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/**
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* @file layer-selector-dnd.c
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* @brief This file implements the drag and drop functions regarding the list box containing the layer elements
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* @author Mario Hüttel <mario.huettel@gmx.net>
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*/
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#include "layer-selector-dnd.h"
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static GtkTargetEntry entries[] = {
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{ "GTK_LIST_BOX_ROW", GTK_TARGET_SAME_APP, 0 }
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};
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static GtkListBoxRow *layer_selector_get_last_row (GtkListBox *list)
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{
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int i;
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GtkListBoxRow *row;
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row = NULL;
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for (i = 0; ; i++) {
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GtkListBoxRow *tmp;
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tmp = gtk_list_box_get_row_at_index(list, i);
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if (tmp == NULL)
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break;
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row = tmp;
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}
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return row;
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}
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static GtkListBoxRow *layer_selector_get_row_before (GtkListBox *list, GtkListBoxRow *row)
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{
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int pos;
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pos = gtk_list_box_row_get_index (row);
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return gtk_list_box_get_row_at_index (list, pos - 1);
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}
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static GtkListBoxRow *layer_selector_get_row_after (GtkListBox *list, GtkListBoxRow *row)
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{
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int pos;
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pos = gtk_list_box_row_get_index(row);
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return gtk_list_box_get_row_at_index(list, pos + 1);
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}
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static void layer_selector_drag_data_received(GtkWidget *widget, GdkDragContext *context, gint x, gint y,
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GtkSelectionData *selection_data, guint info, guint32 time,
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gpointer data)
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{
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GtkWidget *row_before, *row_after;
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GtkWidget *row;
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GtkWidget *source;
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int pos;
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row_before = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "row-before"));
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row_after = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "row-after"));
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g_object_set_data(G_OBJECT(widget), "row-before", NULL);
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g_object_set_data(G_OBJECT(widget), "row-after", NULL);
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if (row_before)
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gtk_style_context_remove_class(gtk_widget_get_style_context(row_before), "drag-hover-bottom");
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if (row_after)
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gtk_style_context_remove_class(gtk_widget_get_style_context(row_after), "drag-hover-top");
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row = (gpointer) *((gpointer *)gtk_selection_data_get_data(selection_data));
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source = gtk_widget_get_ancestor(row, GTK_TYPE_LIST_BOX_ROW);
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if (source == row_after)
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return;
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g_object_ref(source);
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gtk_container_remove(GTK_CONTAINER(gtk_widget_get_parent(source)), source);
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if (row_after)
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pos = gtk_list_box_row_get_index(GTK_LIST_BOX_ROW(row_after));
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else
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pos = gtk_list_box_row_get_index(GTK_LIST_BOX_ROW(row_before)) + 1;
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gtk_list_box_insert(GTK_LIST_BOX(widget), source, pos);
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g_object_unref(source);
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}
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static gboolean layer_selector_drag_motion(GtkWidget *widget, GdkDragContext *context, int x, int y, guint time)
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{
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GtkAllocation alloc;
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GtkWidget *row;
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int hover_row_y;
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int hover_row_height;
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GtkWidget *drag_row;
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GtkWidget *row_before;
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GtkWidget *row_after;
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row = GTK_WIDGET(gtk_list_box_get_row_at_y(GTK_LIST_BOX(widget), y));
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drag_row = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "drag-row"));
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row_after = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "row-after"));
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row_before = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "row-before"));
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gtk_style_context_remove_class(gtk_widget_get_style_context(drag_row), "drag-hover");
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if (row_before)
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gtk_style_context_remove_class(gtk_widget_get_style_context(row_before), "drag-hover-bottom");
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if (row_after)
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gtk_style_context_remove_class(gtk_widget_get_style_context(row_after), "drag-hover-top");
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if (row) {
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gtk_widget_get_allocation(row, &alloc);
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hover_row_y = alloc.y;
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hover_row_height = alloc.height;
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if (y < hover_row_y + hover_row_height/2) {
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row_after = row;
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row_before = GTK_WIDGET(layer_selector_get_row_before(GTK_LIST_BOX(widget), GTK_LIST_BOX_ROW(row)));
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} else {
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row_before = row;
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row_after = GTK_WIDGET(layer_selector_get_row_after(GTK_LIST_BOX(widget), GTK_LIST_BOX_ROW(row)));
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}
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} else {
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row_before = GTK_WIDGET(layer_selector_get_last_row(GTK_LIST_BOX(widget)));
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row_after = NULL;
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}
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g_object_set_data(G_OBJECT(widget), "row-before", row_before);
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g_object_set_data(G_OBJECT(widget), "row-after", row_after);
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if (drag_row == row_before || drag_row == row_after) {
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gtk_style_context_add_class(gtk_widget_get_style_context(drag_row), "drag-hover");
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return FALSE;
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}
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if (row_before)
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gtk_style_context_add_class(gtk_widget_get_style_context(row_before), "drag-hover-bottom");
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if (row_after)
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gtk_style_context_add_class(gtk_widget_get_style_context(row_after), "drag-hover-top");
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return TRUE;
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}
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static void layer_selector_drag_leave(GtkWidget *widget, GdkDragContext *context, guint time)
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{
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GtkWidget *drag_row;
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GtkWidget *row_before;
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GtkWidget *row_after;
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drag_row = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "drag-row"));
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row_before = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "row-before"));
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row_after = GTK_WIDGET(g_object_get_data(G_OBJECT(widget), "row-after"));
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gtk_style_context_remove_class(gtk_widget_get_style_context(drag_row), "drag-hover");
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if (row_before)
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gtk_style_context_remove_class(gtk_widget_get_style_context(row_before), "drag-hover-bottom");
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if (row_after)
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gtk_style_context_remove_class(gtk_widget_get_style_context(row_after), "drag-hover-top");
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}
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static const char *dnd_additional_css =
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".row:not(:first-child) { "
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" border-top: 1px solid alpha(gray,0.5); "
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" border-bottom: 1px solid transparent; "
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"}"
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".row:first-child { "
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" border-top: 1px solid transparent; "
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" border-bottom: 1px solid transparent; "
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"}"
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".row:last-child { "
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" border-top: 1px solid alpha(gray,0.5); "
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" border-bottom: 1px solid alpha(gray,0.5); "
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"}"
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".row.drag-icon { "
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" background: #282828; "
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" border: 1px solid blue; "
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"}"
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".row.drag-row { "
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" color: gray; "
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" background: alpha(gray,0.2); "
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"}"
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".row.drag-row.drag-hover { "
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" border-top: 1px solid #4e9a06; "
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" border-bottom: 1px solid #4e9a06; "
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"}"
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".row.drag-hover image, "
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".row.drag-hover label { "
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" color: #4e9a06; "
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"}"
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".row.drag-hover-top {"
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" border-top: 1px solid #4e9a06; "
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"}"
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".row.drag-hover-bottom {"
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" border-bottom: 1px solid #4e9a06; "
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"}";
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void layer_selector_list_box_setup_dnd(GtkListBox *box)
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{
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GtkCssProvider *provider;
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provider = gtk_css_provider_new ();
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gtk_css_provider_load_from_data (provider, dnd_additional_css, -1, NULL);
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gtk_style_context_add_provider_for_screen (gdk_screen_get_default (), GTK_STYLE_PROVIDER (provider), 800);
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gtk_drag_dest_set(GTK_WIDGET(box), GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_DROP, entries, 1, GDK_ACTION_MOVE);
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g_signal_connect(box, "drag-data-received", G_CALLBACK(layer_selector_drag_data_received), NULL);
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g_signal_connect(box, "drag-motion", G_CALLBACK(layer_selector_drag_motion), NULL);
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g_signal_connect(box, "drag-leave", G_CALLBACK(layer_selector_drag_leave), NULL);
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}
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