gecko-dev/gfx/public/nsITheme.h

167 lines
6.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla browser.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* service providing platform-specific native rendering for widgets */
#ifndef nsITheme_h_
#define nsITheme_h_
#include "nsISupports.h"
#include "nsCOMPtr.h"
#include "nsColor.h"
struct nsRect;
struct nsSize;
struct nsFont;
struct nsMargin;
class nsPresContext;
class nsIRenderingContext;
class nsIDeviceContext;
class nsIFrame;
class nsIContent;
class nsIAtom;
// IID for the nsITheme interface
// {df8baf21-5ea7-49eb-a2bc-f2fd4a9fd896}
#define NS_ITHEME_IID \
{ 0xdf8baf21, 0x5ea7, 0x49eb, { 0xa2, 0xbc, 0xf2, 0xfd, 0x4a, 0x9f, 0xd8, 0x96 } }
// {D930E29B-6909-44e5-AB4B-AF10D6923705}
#define NS_THEMERENDERER_CID \
{ 0xd930e29b, 0x6909, 0x44e5, { 0xab, 0x4b, 0xaf, 0x10, 0xd6, 0x92, 0x37, 0x5 } }
/**
* nsITheme is a service that provides platform-specific native
* rendering for widgets. In other words, it provides the necessary
* operations to draw a rendering object (an nsIFrame) as a native
* widget.
*
* All the methods on nsITheme take a rendering context or device
* context, a frame (the rendering object), and a widget type (one of
* the constants in nsThemeConstants.h).
*/
class nsITheme: public nsISupports {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ITHEME_IID)
NS_IMETHOD DrawWidgetBackground(nsIRenderingContext* aContext,
nsIFrame* aFrame,
PRUint8 aWidgetType,
const nsRect& aRect,
const nsRect& aClipRect)=0;
/**
* Get the computed CSS border for the widget, in pixels.
*/
NS_IMETHOD GetWidgetBorder(nsIDeviceContext* aContext,
nsIFrame* aFrame,
PRUint8 aWidgetType,
nsMargin* aResult)=0;
/**
* This method can return PR_FALSE to indicate that the CSS padding
* value should be used. Otherwise, it will fill in aResult with the
* computed padding, in pixels, and return PR_TRUE.
*
* XXXldb This ought to be required to return true for non-containers
* so that we don't let specified padding that has no effect change
* the computed padding and potentially the size.
*/
virtual PRBool GetWidgetPadding(nsIDeviceContext* aContext,
nsIFrame* aFrame,
PRUint8 aWidgetType,
nsMargin* aResult) = 0;
/**
* This method can return PR_FALSE to indicate that no special
* overflow area is required by the native widget. Otherwise it will
* fill in aResult with the desired overflow area, in twips, relative
* to the widget origin, and return PR_TRUE.
*/
virtual PRBool GetWidgetOverflow(nsIDeviceContext* aContext,
nsIFrame* aFrame,
PRUint8 aWidgetType,
nsRect* aResult)
{ return PR_FALSE; }
/**
* Get the minimum border-box size of a widget, in *pixels* (in
* |aResult|). If |aIsOverridable| is set to true, this size is a
* minimum size; if false, this size is the only valid size for the
* widget.
*/
NS_IMETHOD GetMinimumWidgetSize(nsIRenderingContext* aContext,
nsIFrame* aFrame,
PRUint8 aWidgetType,
nsSize* aResult,
PRBool* aIsOverridable)=0;
NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, PRUint8 aWidgetType,
nsIAtom* aAttribute, PRBool* aShouldRepaint)=0;
NS_IMETHOD ThemeChanged()=0;
/**
* Can the nsITheme implementation handle this widget?
*/
virtual PRBool ThemeSupportsWidget(nsPresContext* aPresContext,
nsIFrame* aFrame,
PRUint8 aWidgetType)=0;
virtual PRBool WidgetIsContainer(PRUint8 aWidgetType)=0;
/**
* Does the nsITheme implementation draw its own focus ring for this widget?
*/
virtual PRBool ThemeDrawsFocusForWidget(nsPresContext* aPresContext,
nsIFrame* aFrame,
PRUint8 aWidgetType)=0;
/**
* Should we insert a dropmarker inside of combobox button?
*/
virtual PRBool ThemeNeedsComboboxDropmarker()=0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsITheme, NS_ITHEME_IID)
// Creator function
extern NS_METHOD NS_NewNativeTheme(nsISupports *aOuter, REFNSIID aIID, void **aResult);
#endif