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treeview-tutorial-xml/examples/cell-renderer-spin/cellrendererspin.c

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Initial commit This is the latest version found at http://scentric.net/tutorial/treeview-tutorial-xml.tar.gz
2014-07-22 23:28:11 +00:00
/***************************************************************************
cellrendererspin.c
------------------
begin : Tue Oct 21 2003
copyright : (C) 2003 by Tim-Philipp M<EFBFBD>ller
email : t.i.m at orange dot net
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/*
*
* This is a dirty 15-minute hack that tries to
* make editable cells with spin buttons instead
* of the text entry widget.
*
* Modify how you please. At the moment you need
* to hook up your own cell data function to make
* sure that the number of digits is the same in
* editing mode as it is in non-editing mode.
*
* The parameters passed to _new() should probably
* be properties, and probably we don't need most
* of them anyway. Also, it would be good if there
* was a better method to ensure that the number
* of digits is the same without this.
*
* Maybe one should just rip out the whole _render
* stuff from GtkCellRendererText and make a
* whole new specialised GtkCellRenderFloat
* or something.
*
* If anyone ever completes this code to sth useful,
* or achieves sth similar in another way, or has
* any comments on it, please drop me a mail.
*/
#include "cellrendererspin.h"
#include <gtk/gtkadjustment.h>
#include <gtk/gtkspinbutton.h>
#include <stdlib.h>
#define GUI_CELL_RENDERER_SPIN_PATH "gui-cell-renderer-spin-path"
#define GUI_CELL_RENDERER_SPIN_INFO "gui-cell-renderer-spin-info"
/* Some boring function declarations: GObject type system stuff */
static void gui_cell_renderer_spin_init (GuiCellRendererSpin *cellspin);
static void gui_cell_renderer_spin_class_init (GuiCellRendererSpinClass *klass);
static void gui_cell_renderer_spin_finalize (GObject *gobject);
static gpointer parent_class;
static GtkCellEditable *gui_cell_renderer_spin_start_editing (GtkCellRenderer *cell,
GdkEvent *event,
GtkWidget *widget,
const gchar *path,
GdkRectangle *background_area,
GdkRectangle *cell_area,
GtkCellRendererState flags);
struct _GCRSpinInfo
{
gulong focus_out_id;
};
typedef struct _GCRSpinInfo GCRSpinInfo;
/***************************************************************************
*
* gui_cell_renderer_spin_get_type
*
* Here we register our type with the GObject type system if we
* haven't done so yet. Everything else is done in the callbacks.
*
***************************************************************************/
GType
gui_cell_renderer_spin_get_type (void)
{
static GType cell_spin_type = 0;
if (cell_spin_type)
return cell_spin_type;
if (1)
{
static const GTypeInfo cell_spin_info =
{
sizeof (GuiCellRendererSpinClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gui_cell_renderer_spin_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GuiCellRendererSpin),
0, /* n_preallocs */
(GInstanceInitFunc) gui_cell_renderer_spin_init,
};
/* Derive from GtkCellRenderer */
cell_spin_type = g_type_register_static (GTK_TYPE_CELL_RENDERER_TEXT,
"GuiCellRendererSpin",
&cell_spin_info,
0);
}
return cell_spin_type;
}
/***************************************************************************
*
* gui_cell_renderer_spin_init
*
* Set some default properties of the parent (GtkCellRendererText).
*
***************************************************************************/
static void
gui_cell_renderer_spin_init (GuiCellRendererSpin *cellrendererspin)
{
return;
}
/***************************************************************************
*
* gui_cell_renderer_spin_class_init:
*
***************************************************************************/
static void
gui_cell_renderer_spin_class_init (GuiCellRendererSpinClass *klass)
{
GtkCellRendererClass *cell_class = GTK_CELL_RENDERER_CLASS(klass);
GObjectClass *object_class = G_OBJECT_CLASS(klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gui_cell_renderer_spin_finalize;
/* Override the cell renderer's edit-related methods */
cell_class->start_editing = gui_cell_renderer_spin_start_editing;
}
/***************************************************************************
*
* gui_cell_renderer_spin_finalize: free any resources here
*
***************************************************************************/
static void
gui_cell_renderer_spin_finalize (GObject *object)
{
/*
GuiCellRendererSpin *cellrendererspin = GUI_CELL_RENDERER_SPIN(object);
*/
/* Free any dynamically allocated resources here */
/* chain up to parent class to make sure
* they release all their memory as well */
(* G_OBJECT_CLASS (parent_class)->finalize) (object);
}
/***************************************************************************
*
* gui_cell_renderer_spin_new
*
* return a new cell renderer instance
* (all the parameters should really be properties)
*
* Not sure which of all these values are really
* relevant for the spin button - needs checking!
*
***************************************************************************/
GtkCellRenderer *
gui_cell_renderer_spin_new (gdouble lower,
gdouble upper,
gdouble step_inc,
gdouble page_inc,
gdouble page_size,
gdouble climb_rate,
guint digits)
{
GtkCellRenderer *cell;
GuiCellRendererSpin *spincell;
cell = g_object_new(GUI_TYPE_CELL_RENDERER_SPIN, NULL);
spincell = GUI_CELL_RENDERER_SPIN(cell);
spincell->lower = lower;
spincell->upper = upper;
spincell->step_inc = step_inc;
spincell->page_inc = page_inc;
spincell->page_size = page_size;
spincell->climb_rate = climb_rate;
spincell->digits = digits;
return cell;
}
/***************************************************************************
*
* gui_cell_renderer_spin_editing_done
*
***************************************************************************/
static void
gui_cell_renderer_spin_editing_done (GtkCellEditable *spinbutton,
gpointer data)
{
const gchar *path;
const gchar *new_text;
GCRSpinInfo *info;
info = g_object_get_data (G_OBJECT (data), GUI_CELL_RENDERER_SPIN_INFO);
if (info->focus_out_id > 0)
{
g_signal_handler_disconnect (spinbutton, info->focus_out_id);
info->focus_out_id = 0;
}
if (GTK_ENTRY(spinbutton)->editing_canceled)
return;
path = g_object_get_data (G_OBJECT (spinbutton), GUI_CELL_RENDERER_SPIN_PATH);
new_text = gtk_entry_get_text (GTK_ENTRY(spinbutton));
g_signal_emit_by_name(data, "edited", path, new_text);
}
/***************************************************************************
*
* gui_cell_renderer_spin_focus_out_event
*
***************************************************************************/
static gboolean
gui_cell_renderer_spin_focus_out_event (GtkWidget *spinbutton,
GdkEvent *event,
gpointer data)
{
gui_cell_renderer_spin_editing_done (GTK_CELL_EDITABLE (spinbutton), data);
/* entry needs focus-out-event */
return FALSE;
}
/***************************************************************************
*
* gui_cell_renderer_spin_start_editing
*
***************************************************************************/
static gboolean
onButtonPress (GtkWidget *spinbutton, GdkEventButton *bevent, gpointer data)
{
if (bevent->button == 1 && bevent->type == GDK_2BUTTON_PRESS || bevent->type == GDK_3BUTTON_PRESS)
{
g_print ("double or triple click caught and ignored.\n");
return TRUE; /* don't invoke other handlers */
}
return FALSE;
}
/***************************************************************************
*
* gui_cell_renderer_spin_start_editing
*
***************************************************************************/
static GtkCellEditable *
gui_cell_renderer_spin_start_editing (GtkCellRenderer *cell,
GdkEvent *event,
GtkWidget *widget,
const gchar *path,
GdkRectangle *background_area,
GdkRectangle *cell_area,
GtkCellRendererState flags)
{
GtkCellRendererText *celltext;
GuiCellRendererSpin *spincell;
GtkAdjustment *adj;
GtkWidget *spinbutton;
GCRSpinInfo *info;
gdouble curval = 0.0;
celltext = GTK_CELL_RENDERER_TEXT(cell);
spincell = GUI_CELL_RENDERER_SPIN(cell);
/* If the cell isn't editable we return NULL. */
if (celltext->editable == FALSE)
return NULL;
spinbutton = g_object_new (GTK_TYPE_SPIN_BUTTON, "has_frame", FALSE, "numeric", TRUE, NULL);
/* dirty */
if (celltext->text)
curval = atof(celltext->text);
adj = GTK_ADJUSTMENT(gtk_adjustment_new(curval,
spincell->lower,
spincell->upper,
spincell->step_inc,
spincell->page_inc,
spincell->page_size));
gtk_spin_button_configure(GTK_SPIN_BUTTON(spinbutton), adj, spincell->climb_rate, spincell->digits);
g_object_set_data_full (G_OBJECT(spinbutton), GUI_CELL_RENDERER_SPIN_PATH, g_strdup (path), g_free);
gtk_editable_select_region (GTK_EDITABLE (spinbutton), 0, -1);
gtk_widget_show (spinbutton);
g_signal_connect (spinbutton, "editing_done",
G_CALLBACK (gui_cell_renderer_spin_editing_done),
celltext);
/* hack trying to catch the quite annoying effect
* a double click has while editing */
g_signal_connect (spinbutton, "button_press_event",
G_CALLBACK (onButtonPress),
NULL);
info = g_new0(GCRSpinInfo, 1);
info->focus_out_id = g_signal_connect (spinbutton, "focus_out_event",
G_CALLBACK (gui_cell_renderer_spin_focus_out_event),
celltext);
g_object_set_data_full (G_OBJECT (cell), GUI_CELL_RENDERER_SPIN_INFO, info, g_free);
return GTK_CELL_EDITABLE (spinbutton);
}
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