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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) 2000-2003 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 <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "gimpwidgetstypes.h"
#include "gimpdialog.h"
#include "gimphelpui.h"
#include "gimpwidgets-private.h"
typedef enum
{
GIMP_WIDGET_HELP_TYPE_HELP = 0xff
} GimpWidgetHelpType;
/* local variables */
static gboolean tooltips_enabled = TRUE;
static gboolean tooltips_enable_called = FALSE;
/* local function prototypes */
static const gchar * gimp_help_get_help_data (GtkWidget *widget,
GtkWidget **help_widget,
gpointer *ret_data);
static gboolean gimp_help_callback (GtkWidget *widget,
GimpWidgetHelpType help_type,
GimpHelpFunc help_func);
static gboolean gimp_context_help_idle_start (gpointer widget);
static gboolean gimp_context_help_button_press (GtkWidget *widget,
GdkEventButton *bevent,
gpointer data);
static gboolean gimp_context_help_key_press (GtkWidget *widget,
GdkEventKey *kevent,
gpointer data);
static gboolean gimp_context_help_idle_show_help (gpointer data);
/* public functions */
/**
* gimp_help_enable_tooltips:
*
* This function calls gtk_tooltips_enable().
**/
void
gimp_help_enable_tooltips (void)
{
if (! tooltips_enable_called)
{
tooltips_enable_called = TRUE;
tooltips_enabled = TRUE;
}
}
/**
* gimp_help_disable_tooltips:
*
* This function calls gtk_tooltips_disable().
**/
void
gimp_help_disable_tooltips (void)
{
if (! tooltips_enable_called)
{
tooltips_enable_called = TRUE;
tooltips_enabled = FALSE;
}
}
/**
* gimp_standard_help_func:
* @help_id: A unique help identifier.
* @help_data: The @help_data passed to gimp_help_connect().
*
* This is the standard GIMP help function which does nothing but calling
* gimp_help(). It is the right function to use in almost all cases.
**/
void
gimp_standard_help_func (const gchar *help_id,
gpointer help_data)
{
if (! _gimp_standard_help_func)
{
g_warning ("%s: you must call gimp_widgets_init() before using "
"the help system", G_STRFUNC);
return;
}
(* _gimp_standard_help_func) (help_id, help_data);
}
/**
* 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_id: The @help_id which will be passed to @help_func.
* @help_data: The @help_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_id,
gpointer help_data)
{
static gboolean initialized = FALSE;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (help_func != NULL);
/* set up the help signals
*/
if (! initialized)
{
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);
initialized = TRUE;
}
gimp_help_set_help_data (widget, NULL, help_id);
g_object_set_data (G_OBJECT (widget), "gimp-help-data", help_data);
g_signal_connect (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_id for.
* @tooltip: The text for this widget's tooltip (or %NULL).
* @help_id: The @help_id 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_id) without a visible
* @tooltip.
*
* This function can be called with #NULL for @tooltip. Use this feature
* if you want to set a help link for a widget which shouldn't have
* a visible tooltip.
**/
void
gimp_help_set_help_data (GtkWidget *widget,
const gchar *tooltip,
const gchar *help_id)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
if (tooltips_enabled)
gtk_widget_set_tooltip_text (widget, tooltip);
g_object_set_qdata (G_OBJECT (widget), GIMP_HELP_ID, (gpointer) help_id);
}
/**
* gimp_help_set_help_data_with_markup:
* @widget: The #GtkWidget you want to set a @tooltip and/or @help_id for.
* @tooltip: The markup for this widget's tooltip (or %NULL).
* @help_id: The @help_id for the #GtkTipsQuery tooltips inspector.
*
* Just like gimp_help_set_help_data(), but it allows to pass text which
* is marked up with
* <link linkend="PangoMarkupFormat">Pango text markup language</link>.
*
* Since: GIMP 2.6
**/
void
gimp_help_set_help_data_with_markup (GtkWidget *widget,
const gchar *tooltip,
const gchar *help_id)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
if (tooltips_enabled)
gtk_widget_set_tooltip_markup (widget, tooltip);
g_object_set_qdata (G_OBJECT (widget), GIMP_HELP_ID, (gpointer) help_id);
}
/**
* gimp_context_help:
* @widget: Any #GtkWidget on the screen.
*
* This function invokes the context help 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_id string attached
* (see gimp_help_set_help_data()), the corresponding help page will
* be displayed. Otherwise the help system will ascend the widget hierarchy
* until it finds an attached @help_id string (which should be the
* case at least for every window/dialog).
**/
void
gimp_context_help (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gimp_help_callback (widget, GTK_WIDGET_HELP_WHATS_THIS, NULL);
}
/**
* gimp_help_id_quark:
*
* This function returns the #GQuark which should be used as key when
* attaching help IDs to widgets and objects.
*
* Return value: The #GQuark.
*
* Since: GIMP 2.2
**/
GQuark
gimp_help_id_quark (void)
{
static GQuark quark = 0;
if (! quark)
quark = g_quark_from_static_string ("gimp-help-id");
return quark;
}
/* private functions */
static const gchar *
gimp_help_get_help_data (GtkWidget *widget,
GtkWidget **help_widget,
gpointer *ret_data)
{
gchar *help_id = NULL;
gpointer help_data = NULL;
for (; widget; widget = widget->parent)
{
help_id = g_object_get_qdata (G_OBJECT (widget), GIMP_HELP_ID);
help_data = g_object_get_data (G_OBJECT (widget), "gimp-help-data");
if (help_id)
{
if (help_widget)
*help_widget = widget;
if (ret_data)
*ret_data = help_data;
return (const gchar *) help_id;
}
}
if (help_widget)
*help_widget = NULL;
if (ret_data)
*ret_data = NULL;
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_id = NULL;
gpointer help_data = NULL;
help_id = g_object_get_qdata (G_OBJECT (widget), GIMP_HELP_ID);
help_data = g_object_get_data (G_OBJECT (widget), "gimp-help-data");
(* help_func) (help_id, help_data);
}
return TRUE;
case GTK_WIDGET_HELP_WHATS_THIS:
g_idle_add (gimp_context_help_idle_start, widget);
return TRUE;
default:
break;
}
return FALSE;
}
/* Do all the actual context help 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 GIMP has grabbed it (e.g. a tool, eek)
*/
static gboolean
gimp_context_help_idle_start (gpointer widget)
{
if (! gtk_grab_get_current ())
{
GtkWidget *invisible;
GdkCursor *cursor;
GdkGrabStatus status;
invisible = gtk_invisible_new_for_screen (gtk_widget_get_screen (widget));
gtk_widget_show (invisible);
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (invisible),
GDK_QUESTION_ARROW);
status = gdk_pointer_grab (invisible->window, TRUE,
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_ENTER_NOTIFY_MASK |
GDK_LEAVE_NOTIFY_MASK,
NULL, cursor,
GDK_CURRENT_TIME);
gdk_cursor_unref (cursor);
if (status != GDK_GRAB_SUCCESS)
{
gtk_widget_destroy (invisible);
return FALSE;
}
if (gdk_keyboard_grab (invisible->window, TRUE,
GDK_CURRENT_TIME) != GDK_GRAB_SUCCESS)
{
gdk_display_pointer_ungrab (gtk_widget_get_display (invisible),
GDK_CURRENT_TIME);
gtk_widget_destroy (invisible);
return FALSE;
}
gtk_grab_add (invisible);
g_signal_connect (invisible, "button-press-event",
G_CALLBACK (gimp_context_help_button_press),
NULL);
g_signal_connect (invisible, "key-press-event",
G_CALLBACK (gimp_context_help_key_press),
NULL);
}
return FALSE;
}
static gboolean
gimp_context_help_button_press (GtkWidget *widget,
GdkEventButton *bevent,
gpointer data)
{
GtkWidget *event_widget = gtk_get_event_widget ((GdkEvent *) bevent);
if (event_widget && bevent->button == 1 && bevent->type == GDK_BUTTON_PRESS)
{
GdkDisplay *display = gtk_widget_get_display (widget);
gtk_grab_remove (widget);
gdk_display_keyboard_ungrab (display, bevent->time);
gdk_display_pointer_ungrab (display, bevent->time);
gtk_widget_destroy (widget);
if (event_widget != widget)
g_idle_add (gimp_context_help_idle_show_help, event_widget);
}
return TRUE;
}
static gboolean
gimp_context_help_key_press (GtkWidget *widget,
GdkEventKey *kevent,
gpointer data)
{
if (kevent->keyval == GDK_Escape)
{
GdkDisplay *display = gtk_widget_get_display (widget);
gtk_grab_remove (widget);
gdk_display_keyboard_ungrab (display, kevent->time);
gdk_display_pointer_ungrab (display, kevent->time);
gtk_widget_destroy (widget);
}
return TRUE;
}
static gboolean
gimp_context_help_idle_show_help (gpointer data)
{
GtkWidget *help_widget;
const gchar *help_id = NULL;
gpointer help_data = NULL;
help_id = gimp_help_get_help_data (GTK_WIDGET (data), &help_widget,
&help_data);
if (help_id)
gimp_standard_help_func (help_id, help_data);
return FALSE;
}
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