ui_tree_edit.c

Gqview,Linux下基于GTK+库写成的轻量级而能丰富的图像浏览程序。

/*
 * (SLIK) SimpLIstic sKin functions
 * (C) 2004 John Ellis
 *
 * Author: John Ellis
 *
 * This software is released under the GNU General Public License (GNU GPL).
 * Please read the included file COPYING for more information.
 * This software comes with no warranty of any kind, use at your own risk!
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif
#include "intl.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

#include "ui_tree_edit.h"

/*
 *-------------------------------------------------------------------
 * cell popup editor
 *-------------------------------------------------------------------
 */

static void tree_edit_close(TreeEditData *ted)
{
	gtk_grab_remove(ted->window);
	gdk_keyboard_ungrab(GDK_CURRENT_TIME);
	gdk_pointer_ungrab(GDK_CURRENT_TIME);

	gtk_widget_destroy(ted->window);

	g_free(ted->old_name);
	g_free(ted->new_name);
	gtk_tree_path_free(ted->path);

	g_free(ted);
}

static void tree_edit_do(TreeEditData *ted)
{
	ted->new_name = g_strdup(gtk_entry_get_text(GTK_ENTRY(ted->entry)));

	if (strcmp(ted->new_name, ted->old_name) != 0)
		{
		if (ted->edit_func)
			{
			if (ted->edit_func(ted, ted->old_name, ted->new_name, ted->edit_data))
				{
				/* hmm, should the caller be required to set text instead ? */
				}
			}
		}
}

static gint tree_edit_click_end_cb(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
	TreeEditData *ted = data;

	tree_edit_do(ted);
	tree_edit_close(ted);

	return TRUE;
}

static gint tree_edit_click_cb(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
	TreeEditData *ted = data;

	gint x, y;
	gint w, h;

	gint xr, yr;

	xr = (gint)event->x_root;
	yr = (gint)event->y_root;

	gdk_window_get_origin(ted->window->window, &x, &y);
	gdk_drawable_get_size(ted->window->window, &w, &h);

	if (xr < x || yr < y || xr > x + w || yr > y + h)
		{
		/* gobble the release event, so it does not propgate to an underlying widget */
		g_signal_connect(G_OBJECT(ted->window), "button_release_event",
				 G_CALLBACK(tree_edit_click_end_cb), ted);
		return TRUE;
		}
	return FALSE;
}

static gint tree_edit_key_press_cb(GtkWidget *widget, GdkEventKey *event, gpointer data)
{
	TreeEditData *ted = data;

	switch (event->keyval)
		{
		case GDK_Return:
		case GDK_KP_Enter:
		case GDK_Tab: 		/* ok, we are going to intercept the focus change
					   from keyboard and act like return was hit */
		case GDK_ISO_Left_Tab:
		case GDK_Up:
		case GDK_Down:
		case GDK_KP_Up:
		case GDK_KP_Down:
		case GDK_KP_Left:
		case GDK_KP_Right:
			tree_edit_do(ted);
			tree_edit_close(ted);
			break;
		case GDK_Escape:
			tree_edit_close(ted);
			break;
		default:
			break;
		}

	return FALSE;
}

static gboolean tree_edit_by_path_idle_cb(gpointer data)
{
	TreeEditData *ted = data;
	GdkRectangle rect;
	gint x, y, w, h;	/* geometry of cell within tree */
	gint wx, wy;		/* geometry of tree from root window */
	gint sx, sw;

	gtk_tree_view_get_cell_area(ted->tree, ted->path, ted->column, &rect);

	x = rect.x;
	y = rect.y;
	w = rect.width + 4;
	h = rect.height + 4;

	if (gtk_tree_view_column_cell_get_position(ted->column, ted->cell, &sx, &sw))
		{
		x += sx;
		w = MAX(w - sx, sw);
		}

	gdk_window_get_origin(gtk_tree_view_get_bin_window(ted->tree), &wx, &wy);

	x += wx - 2; /* the -val is to 'fix' alignment of entry position */
	y += wy - 2;

	/* now show it */
	gtk_widget_set_size_request(ted->window, w, h);
	gtk_widget_realize(ted->window);
	gtk_window_move(GTK_WINDOW(ted->window), x, y);
	gtk_window_resize(GTK_WINDOW(ted->window), w, h);
	gtk_widget_show(ted->window);

	/* grab it */
	gtk_widget_grab_focus(ted->entry);
	/* explicitely set the focus flag for the entry, for some reason on popup windows this
	 * is not set, and causes no edit cursor to appear ( popups not allowed focus? )
	 */
	GTK_WIDGET_SET_FLAGS(ted->entry, GTK_HAS_FOCUS);
	gtk_grab_add(ted->window);
	gdk_pointer_grab(ted->window->window, TRUE,
			 GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_MOTION_MASK,
			 NULL, NULL, GDK_CURRENT_TIME);
	gdk_keyboard_grab(ted->window->window, TRUE, GDK_CURRENT_TIME);

	return FALSE;
}

gint tree_edit_by_path(GtkTreeView *tree, GtkTreePath *tpath, gint column, const gchar *text,
		       gint (*edit_func)(TreeEditData *, const gchar *, const gchar *, gpointer), gpointer data)
{
	TreeEditData *ted;
	GtkTreeViewColumn *tcolumn;
	GtkCellRenderer *cell = NULL;
	GList *list;
	GList *work;

	if (!edit_func) return FALSE;
	if (!GTK_WIDGET_VISIBLE(tree)) return FALSE;

	tcolumn = gtk_tree_view_get_column(tree, column);
	if (!tcolumn) return FALSE;

	list = gtk_tree_view_column_get_cell_renderers(tcolumn);
	work = list;
	while (work && !cell)
		{
		cell = work->data;
		if (!GTK_IS_CELL_RENDERER_TEXT(cell))
			{
			cell = NULL;
			}
		work = work->next;
		}

	g_list_free(list);
	if (!cell) return FALSE;

	if (!text) text = "";

	ted = g_new0(TreeEditData, 1);

	ted->old_name = g_strdup(text);
	ted->new_name = NULL;

	ted->edit_func = edit_func;
	ted->edit_data = data;

	ted->tree = tree;
	ted->path = gtk_tree_path_copy(tpath);
	ted->column = tcolumn;
	ted->cell = cell;

	gtk_tree_view_scroll_to_cell(ted->tree, ted->path, ted->column, FALSE, 0.0, 0.0);

	/* create the window */

	ted->window = gtk_window_new(GTK_WINDOW_POPUP);
	gtk_window_set_resizable(GTK_WINDOW(ted->window), FALSE);
	g_signal_connect(G_OBJECT(ted->window), "button_press_event",
			 G_CALLBACK(tree_edit_click_cb), ted);
	g_signal_connect(G_OBJECT(ted->window), "key_press_event",
			 G_CALLBACK(tree_edit_key_press_cb), ted);

	ted->entry = gtk_entry_new();
	gtk_entry_set_text(GTK_ENTRY(ted->entry), ted->old_name);
	gtk_editable_select_region(GTK_EDITABLE(ted->entry), 0, strlen(ted->old_name));
	gtk_container_add(GTK_CONTAINER(ted->window), ted->entry);
	gtk_widget_show(ted->entry);

	/* due to the fact that gtktreeview scrolls in an idle loop, we cannot
	 * reliably get the cell position until those scroll priority signals are processed
	 */
	g_idle_add_full(G_PRIORITY_DEFAULT_IDLE - 2, tree_edit_by_path_idle_cb, ted, NULL);

	return TRUE;
}

/*
 *-------------------------------------------------------------------
 * tree cell position retrieval
 *-------------------------------------------------------------------
 */

gint tree_view_get_cell_origin(GtkTreeView *widget, GtkTreePath *tpath, gint column, gint text_cell_only,
			       gint *x, gint *y, gint *width, gint *height)
{
	gint x_origin, y_origin;
	gint x_offset, y_offset;
	gint header_size;
	GtkTreeViewColumn *tv_column;
	GdkRectangle rect;

	tv_column = gtk_tree_view_get_column(widget, column);
	if (!tv_column || !tpath) return FALSE;

	/* hmm, appears the rect will not account for X scroll, but does for Y scroll
	 * use x_offset instead for X scroll (sigh)
	 */
	gtk_tree_view_get_cell_area(widget, tpath, tv_column, &rect);
	gtk_tree_view_tree_to_widget_coords(widget, 0, 0, &x_offset, &y_offset);
	gdk_window_get_origin(GTK_WIDGET(widget)->window, &x_origin, &y_origin);

	if (gtk_tree_view_get_headers_visible(widget))
		{
		header_size = tv_column->button->allocation.height;
		}
	else
		{
		header_size = 0;
		}

	if (text_cell_only)
		{
		GtkCellRenderer *cell = NULL;
		GList *renderers;
		GList *work;
		gint cell_x;
		gint cell_width;

		renderers = gtk_tree_view_column_get_cell_renderers(tv_column);
		work = renderers;
		while (work && !cell)
			{
			cell = work->data;
			work = work->next;
			if (!GTK_IS_CELL_RENDERER_TEXT(cell)) cell = NULL;
			}
		g_list_free(renderers);

		if (!cell) return FALSE;
		
		if (!gtk_tree_view_column_cell_get_position(tv_column, cell, &cell_x, &cell_width))
			{
			cell_x = 0;
			cell_width = rect.width;
			}
		*x = x_origin + x_offset + rect.x + cell_x;
		*width = cell_width;
		}
	else
		{
		*x = x_origin + x_offset + rect.x;
		*width = rect.width;
		}
	*y = y_origin + rect.y + header_size;
	*height = rect.height;
	return TRUE;
}

void tree_view_get_cell_clamped(GtkTreeView *widget, GtkTreePath *tpath, gint column, gint text_cell_only,
				gint *x, gint *y, gint *width, gint *height)
{
	gint wx, wy, ww, wh;
	GdkWindow *window;

	window = GTK_WIDGET(widget)->window;
	gdk_window_get_origin(window, &wx, &wy);
	gdk_drawable_get_size(window, &ww, &wh);
	if (!tree_view_get_cell_origin(widget, tpath, column, text_cell_only, x,  y, width, height))
		{
		*x = wx;
		*y = wy;
		*width = ww;
		*height = wh;
		return;
		}

	*width = MIN(*width, ww);
	*x = CLAMP(*x, wx, wx + ww - (*width));
	*y = CLAMP(*y, wy, wy + wh);
	*height = MIN(*height, wy + wh - (*y));