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gimp/libgimpwidgets/gimphelpui.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimphelpui.c
* Copyright (C) 2000 Michael Natterer <mitch@gimp.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#ifdef __GNUC__
#warning GTK_DISABLE_DEPRECATED
#endif
#undef GTK_DISABLE_DEPRECATED
#include <gtk/gtktipsquery.h>
#define GTK_DISABLE_DEPRECATED
#include "gimpwidgetstypes.h"
#include "gimpdialog.h"
#include "gimphelpui.h"
typedef enum
{
GIMP_WIDGET_HELP_TYPE_HELP = 0xff
} GimpWidgetHelpType;
/* local function prototypes */
static const gchar * gimp_help_get_help_data (GtkWidget *widget,
GtkWidget **help_widget);
static gboolean gimp_help_callback (GtkWidget *widget,
GtkWidgetHelpType help_type,
GimpHelpFunc help_func);
static gboolean gimp_help_tips_query_idle_show_help (gpointer data);
static gboolean gimp_help_tips_query_widget_selected (GtkWidget *tips_query,
GtkWidget *widget,
const gchar *tip_text,
const gchar *tip_private,
GdkEventButton *event,
gpointer func_data);
static gboolean gimp_help_tips_query_idle_start (gpointer tips_query);
/* local variables */
static GtkTooltips *tool_tips = NULL;
static GtkWidget *tips_query = NULL;
/* public functions */
/**
* gimp_help_init:
*
* This function initializes GIMP's help system.
*
* Currently it only creates a #GtkTooltips object with gtk_tooltips_new()
* which will be used by gimp_help_set_help_data().
**/
void
gimp_help_init (void)
{
tool_tips = gtk_tooltips_new ();
/* take ownership of the tooltips */
g_object_ref (G_OBJECT (tool_tips));
gtk_object_sink (GTK_OBJECT (tool_tips));
}
/**
* gimp_help_free:
*
* This function frees the memory used by the #GtkTooltips created by
* gimp_help_init().
**/
void
gimp_help_free (void)
{
g_object_unref (G_OBJECT (tool_tips));
tool_tips = NULL;
tips_query->parent = NULL;
gtk_widget_destroy (tips_query);
tips_query = NULL;
}
/**
* gimp_help_enable_tooltips:
*
* This function calls gtk_tooltips_enable().
**/
void
gimp_help_enable_tooltips (void)
{
gtk_tooltips_enable (tool_tips);
}
/**
* gimp_help_disable_tooltips:
*
* This function calls gtk_tooltips_disable().
**/
void
gimp_help_disable_tooltips (void)
{
gtk_tooltips_disable (tool_tips);
}
/**
* gimp_help_connect:
* @widget: The widget you want to connect the help accelerator for. Will
* be a #GtkWindow in most cases.
* @help_func: The function which will be called if the user presses "F1".
* @help_data: The data pointer which will be passed to @help_func.
*
* Note that this function is automatically called by all libgimp dialog
* constructors. You only have to call it for windows/dialogs you created
* "manually".
**/
void
gimp_help_connect (GtkWidget *widget,
GimpHelpFunc help_func,
const gchar *help_data)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (help_func != NULL);
/* set up the help signals and tips query widget
*/
if (! tips_query)
{
GtkBindingSet *binding_set;
binding_set =
gtk_binding_set_by_class (g_type_class_peek (GTK_TYPE_WIDGET));
gtk_binding_entry_add_signal (binding_set, GDK_F1, 0,
"show_help", 1,
GTK_TYPE_WIDGET_HELP_TYPE,
GIMP_WIDGET_HELP_TYPE_HELP);
gtk_binding_entry_add_signal (binding_set, GDK_KP_F1, 0,
"show_help", 1,
GTK_TYPE_WIDGET_HELP_TYPE,
GIMP_WIDGET_HELP_TYPE_HELP);
tips_query = gtk_tips_query_new ();
g_object_set (G_OBJECT (tips_query),
"emit_always", TRUE,
NULL);
g_signal_connect (G_OBJECT (tips_query), "widget_selected",
G_CALLBACK (gimp_help_tips_query_widget_selected),
NULL);
/* FIXME: EEEEEEEEEEEEEEEEEEEEK, this is very ugly and forbidden...
* does anyone know a way to do this tips query stuff without
* having to attach to some parent widget???
*/
tips_query->parent = widget;
gtk_widget_realize (tips_query);
}
gimp_help_set_help_data (widget, NULL, help_data);
g_signal_connect (G_OBJECT (widget), "show_help",
G_CALLBACK (gimp_help_callback),
help_func);
gtk_widget_add_events (widget, GDK_BUTTON_PRESS_MASK);
}
/**
* gimp_help_set_help_data:
* @widget: The #GtkWidget you want to set a @tooltip and/or @help_data for.
* @tooltip: The text for this widget's tooltip.
* @help_data: The @help_data for the #GtkTipsQuery tooltips inspector.
*
* The reason why we don't use gtk_tooltips_set_tip() is that it's
* impossible to set a @private_tip (aka @help_data) without a visible
* @tooltip.
*
* This function can be called with @tooltip == #NULL. Use this feature
* if you want to set a HTML help link for a widget which shouldn't have
* a visible tooltip.
*
* You can e.g. set a @help_data string to a complete HTML page for a
* container widget (e.g. a #GtkBox). For the widgets inside the box
* you can set HTML anchors which point inside the container widget's
* help page by setting @help_data strings starting with "#".
*
* If the tooltips inspector (Shift + "F1") is invoked and the user
* clicks on one of the widgets which only contain a "#" link, the
* help system will automatically ascend the widget hierarchy until it
* finds another widget with @help_data attached and concatenates both
* to a complete help path.
**/
void
gimp_help_set_help_data (GtkWidget *widget,
const gchar *tooltip,
const gchar *help_data)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
if (tooltip)
{
gtk_tooltips_set_tip (tool_tips, widget, tooltip, help_data);
}
else if (help_data)
{
g_object_set_data (G_OBJECT (widget), "gimp_help_data",
(gpointer) help_data);
}
}
/**
* gimp_context_help:
*
* This function invokes the #GtkTipsQuery tooltips inspector.
*
* The mouse cursor will turn turn into a question mark and the user can
* click on any widget of the application which started the inspector.
*
* If the widget the user clicked on has a @help_data string attached
* (see gimp_help_set_help_data()), the corresponding HTML page will
* be displayed. Otherwise the help system will ascend the widget hierarchy
* until it finds an attached @help_data string (which should be the
* case at least for every window/dialog).
**/
void
gimp_context_help (void)
{
if (tips_query)
gimp_help_callback (NULL, GTK_WIDGET_HELP_WHATS_THIS, NULL);
}
/* private functions */
static const gchar *
gimp_help_get_help_data (GtkWidget *widget,
GtkWidget **help_widget)
{
GtkTooltipsData *tooltips_data;
gchar *help_data = NULL;
for (; widget; widget = widget->parent)
{
if ((tooltips_data = gtk_tooltips_data_get (widget)) &&
tooltips_data->tip_private)
{
help_data = tooltips_data->tip_private;
}
else
{
help_data = g_object_get_data (G_OBJECT (widget), "gimp_help_data");
}
if (help_data)
{
if (help_widget)
*help_widget = widget;
return (const gchar *) help_data;
}
}
return NULL;
}
static gboolean
gimp_help_callback (GtkWidget *widget,
GimpWidgetHelpType help_type,
GimpHelpFunc help_func)
{
switch (help_type)
{
case GIMP_WIDGET_HELP_TYPE_HELP:
if (help_func)
{
gchar *help_data;
help_data = g_object_get_data (G_OBJECT (widget), "gimp_help_data");
(* help_func) (help_data);
}
return TRUE;
case GTK_WIDGET_HELP_WHATS_THIS:
if (! GTK_TIPS_QUERY (tips_query)->in_query)
g_idle_add (gimp_help_tips_query_idle_start, tips_query);
return TRUE;
default:
break;
}
return FALSE;
}
/* Do all the actual GtkTipsQuery calls in idle functions and check for
* some widget holding a grab before starting the query because strange
* things happen if (1) the help browser pops up while the query has
* grabbed the pointer or (2) the query grabs the pointer while some
* other part of the gimp has grabbed it (e.g. a tool, eek)
*/
static gboolean
gimp_help_tips_query_idle_show_help (gpointer data)
{
GtkWidget *help_widget;
const gchar *help_data = NULL;
help_data = gimp_help_get_help_data (GTK_WIDGET (data), &help_widget);
if (help_data)
{
if (help_data[0] == '#')
{
const gchar *help_index;
help_index = help_data;
help_data = gimp_help_get_help_data (help_widget->parent, NULL);
if (help_data)
{
gchar *help_text;
help_text = g_strconcat (help_data, help_index, NULL);
gimp_standard_help_func (help_text);
g_free (help_text);
}
}
else
{
gimp_standard_help_func (help_data);
}
}
return FALSE;
}
static gboolean
gimp_help_tips_query_widget_selected (GtkWidget *tips_query,
GtkWidget *widget,
const gchar *tip_text,
const gchar *tip_private,
GdkEventButton *event,
gpointer func_data)
{
if (widget)
g_idle_add (gimp_help_tips_query_idle_show_help, widget);
return TRUE;
}
static gboolean
gimp_help_tips_query_idle_start (gpointer tips_query)
{
if (! gtk_grab_get_current ())
gtk_tips_query_start_query (GTK_TIPS_QUERY (tips_query));
return FALSE;
}
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