// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_COMMON_GTK_UTIL_H_
#define CHROME_COMMON_GTK_UTIL_H_

#include <gtk/gtk.h>
#include <string>
#include <vector>

#include "base/gfx/point.h"
#include "base/gfx/rect.h"
#include "chrome/common/x11_util.h"
#include "webkit/glue/window_open_disposition.h"

typedef struct _GtkWidget GtkWidget;

class GtkThemeProvider;
struct RendererPreferences;  // from common/renderer_preferences.h

namespace event_utils {

// Translates event flags into what kind of disposition they represent.
// For example, a middle click would mean to open a background tab.
// event_flags are the state in the GdkEvent structure.
WindowOpenDisposition DispositionFromEventFlags(guint state);

}  // namespace event_utils

namespace gtk_util {

// Constants relating to the layout of dialog windows:
// (See http://library.gnome.org/devel/hig-book/stable/design-window.html.en)

// Spacing between controls of the same group.
const int kControlSpacing = 6;

// Horizontal spacing between a label and its control.
const int kLabelSpacing = 12;

// Indent of the controls within each group.
const int kGroupIndent = 12;

// Space around the outside of a dialog's contents.
const int kContentAreaBorder = 12;

// Spacing between groups of controls.
const int kContentAreaSpacing = 18;

// Horizontal Spacing between controls in a form.
const int kFormControlSpacing = 10;

// Create a table of labeled controls, using proper spacing and alignment.
// Arguments should be pairs of const char*, GtkWidget*, concluding with a
// NULL.  The first argument is a vector in which to place all labels
// produced. It can be NULL if you don't need to keep track of the label
// widgets. The second argument is a color to force the label text to. It can
// be NULL to get the system default.
//
// For example:
// controls = CreateLabeledControlsGroup(NULL,
//                                       "Name:", title_entry_,
//                                       "Folder:", folder_combobox_,
//                                       NULL);
GtkWidget* CreateLabeledControlsGroup(
    std::vector<GtkWidget*>* labels,
    const char* text, ...);

// Create a GtkBin with |child| as its child widget.  This bin will paint a
// border of color |color| with the sizes specified in pixels.
GtkWidget* CreateGtkBorderBin(GtkWidget* child, const GdkColor* color,
                              int top, int bottom, int left, int right);

// Left-align the given GtkMisc and return the same pointer.
GtkWidget* LeftAlignMisc(GtkWidget* misc);

// Create a left-aligned label with the given text in bold.
GtkWidget* CreateBoldLabel(const std::string& text);

// Calculates the size of given widget based on the size specified in
// number of characters/lines (in locale specific resource file) and
// font metrics.
// NOTE: Make sure to realize |widget| before using this method, or a
// default font size will be used instead of the actual font size.
void GetWidgetSizeFromResources(GtkWidget* widget, int width_chars,
                                int height_lines, int* width, int* height);

// As above, but uses number of characters/lines directly rather than looking
// up a resource.
void GetWidgetSizeFromCharacters(GtkWidget* widget, double width_chars,
                                 double height_lines, int* width, int* height);

// As above, but a convenience method for configuring dialog size.
// |width_id| and |height_id| are resource IDs for the size.  If either of these
// are set to -1, the respective size will be set to the widget default.
// |resizable| also controls whether the dialog will be resizable
// (this info is also necessary for getting the width-setting code
// right).
void SetWindowSizeFromResources(GtkWindow* window,
                                int width_id, int height_id, bool resizable);

// Places |window| approximately over center of |parent|, it also moves window
// to parent's desktop. Use this only for non-modal dialogs, such as the
// options window and content settings window; otherwise you should be using
// transient_for.
void CenterOverWindow(GtkWindow* window, GtkWindow* parent);

// Puts all browser windows in one window group; this will make any dialog
// spawned app modal.
void MakeAppModalWindowGroup();

// Called after an app modal dialog that used MakeAppModalWindowGroup() was
// dismissed. Returns each browser window to its own window group.
void AppModalDismissedUngroupWindows();

// Remove all children from this container.
void RemoveAllChildren(GtkWidget* container);

// Force the font size of the widget to |size_pixels|.
void ForceFontSizePixels(GtkWidget* widget, double size_pixels);

// Gets the position of a gtk widget in screen coordinates.
gfx::Point GetWidgetScreenPosition(GtkWidget* widget);

// Returns the bounds of the specified widget in screen coordinates.
gfx::Rect GetWidgetScreenBounds(GtkWidget* widget);

// Retuns size of the |widget| without window manager decorations.
gfx::Size GetWidgetSize(GtkWidget* widget);

// Converts a point in a widget to screen coordinates.  The point |p| is
// relative to the widget's top-left origin.
void ConvertWidgetPointToScreen(GtkWidget* widget, gfx::Point* p);

// Initialize some GTK settings so that our dialogs are consistent.
void InitRCStyles();

// Stick the widget in the given hbox without expanding vertically. The widget
// is packed at the start of the hbox. This is useful for widgets that would
// otherwise expand to fill the vertical space of the hbox (e.g. buttons).
void CenterWidgetInHBox(GtkWidget* hbox, GtkWidget* widget, bool pack_at_end,
                        int padding);

// Change windows accelerator style to GTK style. (GTK uses _ for
// accelerators.  Windows uses & with && as an escape for &.)
std::string ConvertAcceleratorsFromWindowsStyle(const std::string& label);

// Returns true if the screen is composited, false otherwise.
bool IsScreenComposited();

// Enumerates the top-level gdk windows of the current display.
void EnumerateTopLevelWindows(x11_util::EnumerateWindowsDelegate* delegate);

// Set that clicking the button with the given mouse buttons will cause a click
// event.
// NOTE: If you need to connect to the button-press-event or
// button-release-event signals, do so before calling this function.
void SetButtonClickableByMouseButtons(GtkWidget* button,
                                      bool left, bool middle, bool right);

// Set that a button causes a page navigation. In particular, it will accept
// middle clicks. Warning: only call this *after* you have connected your
// own handlers for button-press and button-release events, or you will not get
// those events.
void SetButtonTriggersNavigation(GtkWidget* button);

// Returns the mirrored x value for |bounds| if the layout is RTL; otherwise,
// the original value is returned unchanged.
int MirroredLeftPointForRect(GtkWidget* widget, const gfx::Rect& bounds);

// Returns the mirrored x value for the point |x| if the layout is RTL;
// otherwise, the original value is returned unchanged.
int MirroredXCoordinate(GtkWidget* widget, int x);

// Returns true if the pointer is currently inside the widget.
bool WidgetContainsCursor(GtkWidget* widget);

// Sets the icon of |window| to the product icon (potentially used in window
// border or alt-tab list).
void SetWindowIcon(GtkWindow* window);

// Sets the default window icon for windows created in this app.
void SetDefaultWindowIcon();

// Adds an action button with the given text to the dialog. Only useful when you
// want a stock icon but not the stock text to go with it. Returns the button.
GtkWidget* AddButtonToDialog(GtkWidget* dialog, const gchar* text,
                             const gchar* stock_id, gint response_id);

// Sets all the foreground color states of |label| to |color|.
void SetLabelColor(GtkWidget* label, const GdkColor* color);

// Adds the given widget to an alignment identing it by |kGroupIndent|.
GtkWidget* IndentWidget(GtkWidget* content);

// Sets (or resets) the font settings in |prefs| (used when creating new
// renderers) based on GtkSettings (which itself comes from XSETTINGS).
void UpdateGtkFontSettings(RendererPreferences* prefs);

// Get the current location of the mouse cursor relative to the screen.
gfx::Point ScreenPoint(GtkWidget* widget);

// Get the current location of the mouse cursor relative to the widget.
gfx::Point ClientPoint(GtkWidget* widget);

// Reverses a point in RTL mode. Used in making vectors of GdkPoints for window
// shapes.
GdkPoint MakeBidiGdkPoint(gint x, gint y, gint width, bool ltr);

// Draws a GTK text entry with the style parameters of GtkEntry
// |offscreen_entry| onto |widget_to_draw_on| in the rectangle |rec|. Drawing
// is only done in the clip rectangle |dirty_rec|.
void DrawTextEntryBackground(GtkWidget* offscreen_entry,
                             GtkWidget* widget_to_draw_on,
                             GdkRectangle* dirty_rec,
                             GdkRectangle* rec);

// Draws the background of the toolbar area subject to the expose rectangle
// |event| and starting image tiling from |tabstrip_origin|.
void DrawThemedToolbarBackground(GtkWidget* widget,
                                 cairo_t* cr,
                                 GdkEventExpose* event,
                                 const gfx::Point& tabstrip_origin,
                                 GtkThemeProvider* provider);

// Returns the two colors averaged together.
GdkColor AverageColors(GdkColor color_one, GdkColor color_two);

// Show the image for the given menu item, even if the user's default is to not
// show images. Only to be used for favicons or other menus where the image is
// crucial to its functionality.
void SetAlwaysShowImage(GtkWidget* image_menu_item);

// Returns a static instance of a GdkCursor* object, sharable across the
// process.  Returns a GdkCursor with a +1 refcount, as if it was just created
// with gdk_cursor_new(); owner must gdk_cursor_unref() it when done with it.
GdkCursor* GetCursor(GdkCursorType type);

// Stacks a |popup| window directly on top of a |toplevel| window.
void StackPopupWindow(GtkWidget* popup, GtkWidget* toplevel);

// Get a rectangle corresponding to a widget's allocation relative to its
// toplevel window's origin.
gfx::Rect GetWidgetRectRelativeToToplevel(GtkWidget* widget);

// A helper function for gtk_message_dialog_new() to work around a KDE 3 window
// manager bugs. You should always call it after creating a dialog with
// gtk_message_dialog_new.
void ApplyMessageDialogQuirks(GtkWidget* dialog);

// Don't allow the widget to paint anything, and instead propagate the expose
// to its children. This is similar to calling
//
//   gtk_widget_set_app_paintable(container, TRUE);
//
// except that it will always work, and it should be called after any custom
// expose events are connected.
void SuppressDefaultPainting(GtkWidget* container);

// Set the label to use a request size equal to the allocation size.  This
// causes the label to wrap at the width of the container it is in, instead of
// at the default width.
// This is called a hack because the gtk docs state that it is logically
// inconsistent for a widget to make its size request depend on its allocation.
// It does, however, have the intended effect of wrapping the label at the
// proper width.
void WrapLabelAtAllocationHack(GtkWidget* label);

// Get the window open disposition from the state in gtk_get_current_event().
// This is designed to be called inside a "clicked" event handler. It is an
// error to call it when gtk_get_current_event() won't return a GdkEventButton*.
WindowOpenDisposition DispositionForCurrentButtonPressEvent();

}  // namespace gtk_util

#endif  // CHROME_COMMON_GTK_UTIL_H_