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436 lines
15 KiB
C++
436 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsIDeviceContext_h___
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#define nsIDeviceContext_h___
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#include "nsISupports.h"
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#include "nsCoord.h"
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#include "nsRect.h"
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#include "nsIWidget.h"
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class nsIRenderingContext;
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class nsIView;
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class nsIFontMetrics;
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class nsIWidget;
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class nsIDeviceContextSpec;
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class nsIAtom;
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struct nsFont;
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struct nsColor;
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//a cross platform way of specifying a native device context
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typedef void * nsNativeDeviceContext;
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#define NS_IDEVICE_CONTEXT_IID \
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{ 0x5931c580, 0xb917, 0x11d1, \
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{ 0xa8, 0x24, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
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//a cross platform way of specifying a native palette handle
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typedef void * nsPalette;
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//structure used to return information about a device's palette capabilities
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struct nsPaletteInfo {
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PRPackedBool isPaletteDevice;
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PRUint8 sizePalette; // number of entries in the palette
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PRUint8 numReserved; // number of reserved palette entries
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nsPalette palette; // native palette handle
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};
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/**
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*
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*
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*/
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typedef enum {
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// Colors
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eSystemAttr_Color_WindowBackground,
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eSystemAttr_Color_WindowForeground,
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eSystemAttr_Color_WidgetBackground,
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eSystemAttr_Color_WidgetForeground,
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eSystemAttr_Color_WidgetSelectBackground,
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eSystemAttr_Color_WidgetSelectForeground,
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eSystemAttr_Color_Widget3DHighlight,
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eSystemAttr_Color_Widget3DShadow,
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eSystemAttr_Color_TextBackground,
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eSystemAttr_Color_TextForeground,
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eSystemAttr_Color_TextSelectBackground,
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eSystemAttr_Color_TextSelectForeground,
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// Size
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eSystemAttr_Size_WindowTitleHeight,
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eSystemAttr_Size_WindowBorderWidth,
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eSystemAttr_Size_WindowBorderHeight,
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eSystemAttr_Size_Widget3DBorder,
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eSystemAttr_Size_ScrollbarHeight,
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eSystemAttr_Size_ScrollbarWidth,
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// Fonts
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eSystemAttr_Font_Caption, // css2
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eSystemAttr_Font_Icon,
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eSystemAttr_Font_Menu,
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eSystemAttr_Font_MessageBox,
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eSystemAttr_Font_SmallCaption,
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eSystemAttr_Font_StatusBar,
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eSystemAttr_Font_Window, // css3
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eSystemAttr_Font_Document,
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eSystemAttr_Font_Workspace,
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eSystemAttr_Font_Desktop,
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eSystemAttr_Font_Info,
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eSystemAttr_Font_Dialog,
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eSystemAttr_Font_Button,
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eSystemAttr_Font_PullDownMenu,
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eSystemAttr_Font_List,
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eSystemAttr_Font_Field,
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eSystemAttr_Font_Tooltips, // moz
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eSystemAttr_Font_Widget
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} nsSystemAttrID;
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typedef union {
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PRUint32 mSize;
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nscolor * mColor;
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nsFont * mFont;
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} SystemAttrStruct;
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/**
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* Constants identifying pre-defined icons.
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* @see #LoadIcon()
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*/
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#define NS_ICON_LOADING_IMAGE 0
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#define NS_ICON_BROKEN_IMAGE 1
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#define NS_NUMBER_OF_ICONS 2
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// XXX This is gross, but don't include libimg.h, because it includes ni_pixmap.h
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// which includes xp_core.h which includes windows.h
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struct _NI_ColorSpace;
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typedef _NI_ColorSpace NI_ColorSpace;
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typedef NI_ColorSpace IL_ColorSpace;
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class nsIDeviceContext : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IDEVICE_CONTEXT_IID)
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/**
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* Initialize the device context from a widget
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* @param aWidget a native widget to initialize the device context from
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* @return error status
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*/
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NS_IMETHOD Init(nsNativeWidget aWidget) = 0;
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/**
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* Create a rendering context and initialize it from an nsIView
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* @param aView view to initialize context from
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext) = 0;
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/**
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* Create a rendering context and initialize it from an nsIWidget
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* @param aWidget widget to initialize context from
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsIWidget *aWidget, nsIRenderingContext *&aContext) = 0;
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/**
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* Create a rendering context and initialize it. This API should *only* be called
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* on device contexts whose SupportsNativeWidgets() method return PR_FALSE.
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsIRenderingContext *&aContext) = 0;
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/**
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* Initialize a rendering context from a widget. This method is only for use
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* when a rendering context was obtained directly from a factory rather than
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* through one of the Create* methods above.
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* @param aContext rendering context to initialize
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* @param aWindow widget to initialize context from
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* @return error status
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*/
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NS_IMETHOD InitRenderingContext(nsIRenderingContext *aContext, nsIWidget *aWindow) = 0;
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/**
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* Query the device to see if it supports native widgets. If not, then
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* nsIWidget->Create() calls should be avoided.
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* @param aSupportsWidgets out paramater. If PR_TRUE, then native widgets
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* can be created.
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* @return error status
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*/
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NS_IMETHOD SupportsNativeWidgets(PRBool &aSupportsWidgets) = 0;
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/**
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* Obtain the size of a device unit relative to a Twip. A twip is 1/20 of
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* a point (which is 1/72 of an inch).
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* @param aDevUnitsToTwips out parameter for conversion value
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* @return error status
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*/
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NS_IMETHOD GetDevUnitsToTwips(float &aDevUnitsToTwips) const = 0;
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/**
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* Obtain the size of a Twip relative to a device unit.
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* @param aTwipsToDevUnits out parameter for conversion value
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* @return error status
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*/
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NS_IMETHOD GetTwipsToDevUnits(float &aTwipsToDevUnits) const = 0;
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/**
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* Set the scale factor to convert units used by the application
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* to device units. Typically, an application will query the device
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* for twips to device units scale and then set the scale
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* to convert from whatever unit the application wants to use
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* to device units. From that point on, all other parts of the
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* app can use the Get* methods below to figure out how
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* to convert device units <-> app units.
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* @param aAppUnits scale value to convert from application defined
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* units to device units.
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* @return error status
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*/
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NS_IMETHOD SetAppUnitsToDevUnits(float aAppUnits) = 0;
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/**
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* Set the scale factor to convert device units to units
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* used by the application. This should generally be
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* 1.0f / the value passed into SetAppUnitsToDevUnits().
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* @param aDevUnits scale value to convert from device units to
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* application defined units
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* @return error status
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*/
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NS_IMETHOD SetDevUnitsToAppUnits(float aDevUnits) = 0;
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/**
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* Get the scale factor to convert from application defined
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* units to device units.
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* @param aAppUnits out paramater for scale value
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* @return error status
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*/
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NS_IMETHOD GetAppUnitsToDevUnits(float &aAppUnits) const = 0;
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/**
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* Get the scale factor to convert from device units to
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* application defined units.
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* @param aDevUnits out paramater for scale value
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* @return error status
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*/
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NS_IMETHOD GetDevUnitsToAppUnits(float &aDevUnits) const = 0;
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/**
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* Get the value used to scale a "standard" pixel to a pixel
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* of the same physical size for this device. a standard pixel
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* is defined as a pixel on display 0. this is used to make
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* sure that entities defined in pixel dimensions maintain a
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* constant relative size when displayed from one output
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* device to another.
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* @param aScale out parameter for scale value
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* @return error status
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*/
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NS_IMETHOD GetCanonicalPixelScale(float &aScale) const = 0;
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/**
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* Get the width of a vertical scroll bar and the height
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* of a horizontal scrollbar in application units.
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* @param aWidth out parameter for width
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* @param aHeight out parameter for height
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* @return error status
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*/
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NS_IMETHOD GetScrollBarDimensions(float &aWidth, float &aHeight) const = 0;
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/**
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* Get the width of a vertical scroll bar and the height
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* of a horizontal scrollbar in application units.
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* @param anID The snum of the type of information you want back
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* @param aInfo out parameter for the system data
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* @return error status
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*/
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NS_IMETHOD GetSystemAttribute(nsSystemAttrID anID, SystemAttrStruct * aInfo) const = 0;
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/**
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* Get the nsIFontMetrics that describe the properties of
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* an nsFont.
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* @param aFont font description to obtain metrics for
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* @param aLangGroup the language group of the document
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* @param aMetrics out parameter for font metrics
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* @return error status
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*/
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NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
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nsIFontMetrics*& aMetrics) = 0;
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/**
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* Get the nsIFontMetrics that describe the properties of
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* an nsFont.
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* @param aFont font description to obtain metrics for
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* @param aMetrics out parameter for font metrics
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* @return error status
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*/
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NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIFontMetrics*& aMetrics) = 0;
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//get and set the document zoom value used for display-time
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//scaling. default is 1.0 (no zoom)
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NS_IMETHOD SetZoom(float aZoom) = 0;
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NS_IMETHOD GetZoom(float &aZoom) const = 0;
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//get and set the text zoom value used for display-time
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//scaling. default is 1.0 (no zoom)
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NS_IMETHOD SetTextZoom(float aTextZoom) = 0;
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NS_IMETHOD GetTextZoom(float &aTextZoom) const = 0;
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//get a low level drawing surface for rendering. the rendering context
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//that is passed in is used to create the drawing surface if there isn't
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//already one in the device context. the drawing surface is then cached
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//in the device context for re-use.
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NS_IMETHOD GetDrawingSurface(nsIRenderingContext &aContext, nsDrawingSurface &aSurface) = 0;
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//functions for handling gamma correction of output device
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NS_IMETHOD GetGamma(float &aGamms) = 0;
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NS_IMETHOD SetGamma(float aGamma) = 0;
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//XXX the return from this really needs to be ref counted somehow. MMP
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NS_IMETHOD GetGammaTable(PRUint8 *&aGammaTable) = 0;
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//load the specified icon. this is a blocking call that does not return
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//until the icon is loaded.
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//release the image when you're done
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NS_IMETHOD LoadIconImage(PRInt32 aId, nsIImage*& aImage) = 0;
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/**
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* Check to see if a particular named font exists.
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* @param aFontName character string of font face name
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* @return NS_OK if font is available, else font is unavailable
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*/
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NS_IMETHOD CheckFontExistence(const nsString& aFaceName) = 0;
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NS_IMETHOD FirstExistingFont(const nsFont& aFont, nsString& aFaceName) = 0;
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NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
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PRBool& aAliased) = 0;
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/**
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* Attempt to free up resoruces by flushing out any fonts no longer
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* referenced by anything other than the font cache itself.
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* @return error status
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*/
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NS_IMETHOD FlushFontCache(void) = 0;
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/**
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* Return the bit depth of the device.
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*/
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NS_IMETHOD GetDepth(PRUint32& aDepth) = 0;
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/**
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* Return the image lib color space that's appropriate for this rendering
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* context.
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*
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* You must call IL_ReleaseSystemSpace() when you're done using the color space.
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*/
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NS_IMETHOD GetILColorSpace(IL_ColorSpace*& aColorSpace) = 0;
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/**
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* Returns information about the device's palette capabilities.
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*/
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NS_IMETHOD GetPaletteInfo(nsPaletteInfo&) = 0;
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/**
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* Returns Platform specific pixel value for an RGB value
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*/
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NS_IMETHOD ConvertPixel(nscolor aColor, PRUint32 & aPixel) = 0;
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/**
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* Get the size of the displayable area of the output device
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* in app units.
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* @param aWidth out parameter for width
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* @param aHeight out parameter for height
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* @return error status
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*/
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NS_IMETHOD GetDeviceSurfaceDimensions(PRInt32 &aWidth, PRInt32 &aHeight) = 0;
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/**
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* Get the size of the content area of the output device in app units.
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* This corresponds on a screen device, for instance, to the entire screen.
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* @param aRect out parameter for full rect. Position (x,y) will be (0,0) or
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* relative to the primary monitor if this is not the primary.
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* @return error status
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*/
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NS_IMETHOD GetRect ( nsRect &aRect ) = 0;
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/**
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* Get the size of the content area of the output device in app units.
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* This corresponds on a screen device, for instance, to the area reported
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* by GetDeviceSurfaceDimensions, minus the taskbar (Windows) or menubar
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* (Macintosh).
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* @param aRect out parameter for client rect. Position (x,y) will be (0,0)
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* adjusted for any upper/left non-client space if present or
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* relative to the primary monitor if this is not the primary.
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* @return error status
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*/
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NS_IMETHOD GetClientRect(nsRect &aRect) = 0;
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/**
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* Returns a new nsIDeviceContext suitable for the device context
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* specification passed in.
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* @param aDevice a device context specification. this is a platform
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* specific structure that only a platform specific device
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* context can interpret.
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* @param aContext out parameter for new device context. nsnull on
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* failure to create new device context.
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* @return error status
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*/
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NS_IMETHOD GetDeviceContextFor(nsIDeviceContextSpec *aDevice,
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nsIDeviceContext *&aContext) = 0;
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//XXX need to work out re-entrancy issues for these APIs... MMP
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/**
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* Inform the output device that output of a document is beginning
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* Used for print related device contexts. Must be matched 1:1 with
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* EndDocument().
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* XXX needs to take parameters so that feedback can be given to the
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* app regarding pagination progress and aborting print operations?
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* @return error status
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*/
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NS_IMETHOD BeginDocument(void) = 0;
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/**
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* Inform the output device that output of a document is ending.
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* Used for print related device contexts. Must be matched 1:1 with
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* BeginDocument()
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* @return error status
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*/
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NS_IMETHOD EndDocument(void) = 0;
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/**
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* Inform the output device that output of a page is beginning
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* Used for print related device contexts. Must be matched 1:1 with
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* EndPage() and within a BeginDocument()/EndDocument() pair.
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* @return error status
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*/
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NS_IMETHOD BeginPage(void) = 0;
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/**
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* Inform the output device that output of a page is ending
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* Used for print related device contexts. Must be matched 1:1 with
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* BeginPage() and within a BeginDocument()/EndDocument() pair.
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* @return error status
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*/
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NS_IMETHOD EndPage(void) = 0;
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};
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#endif /* nsIDeviceContext_h___ */
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