The Tor Browser / annotate

gfx/src/nsITheme.h@97036ab72558 (annotated)

gfx/src/nsITheme.h

Tue, 06 Jan 2015 21:39:09 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Tue, 06 Jan 2015 21:39:09 +0100
branch
TOR_BUG_9701
changeset 8
97036ab72558
permissions
-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0 2 *
michael@0 3 * This Source Code Form is subject to the terms of the Mozilla Public
michael@0 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 6
michael@0 7 /* service providing platform-specific native rendering for widgets */
michael@0 8
michael@0 9 #ifndef nsITheme_h_
michael@0 10 #define nsITheme_h_
michael@0 11
michael@0 12 #include "nsISupports.h"
michael@0 13 #include "nsCOMPtr.h"
michael@0 14 #include "nsColor.h"
michael@0 15
michael@0 16 struct nsRect;
michael@0 17 struct nsIntRect;
michael@0 18 struct nsIntSize;
michael@0 19 class nsIntRegion;
michael@0 20 struct nsFont;
michael@0 21 struct nsIntMargin;
michael@0 22 class nsPresContext;
michael@0 23 class nsRenderingContext;
michael@0 24 class nsDeviceContext;
michael@0 25 class nsIFrame;
michael@0 26 class nsIContent;
michael@0 27 class nsIAtom;
michael@0 28 class nsIWidget;
michael@0 29
michael@0 30 // IID for the nsITheme interface
michael@0 31 // {b0f3efe9-0bd4-4f6b-8daa-0ec7f6006822}
michael@0 32 #define NS_ITHEME_IID \
michael@0 33 { 0x4440b5c7, 0xd8bd, 0x4d9c, \
michael@0 34 { 0x9c, 0x3e, 0xa5, 0xe6, 0x26, 0x81, 0x10, 0xa0 } }
michael@0 35 // {D930E29B-6909-44e5-AB4B-AF10D6923705}
michael@0 36 #define NS_THEMERENDERER_CID \
michael@0 37 { 0x9020805b, 0x14a3, 0x4125, \
michael@0 38 { 0xa5, 0x63, 0x4a, 0x8c, 0x5d, 0xe0, 0xa9, 0xa3 } }
michael@0 39
michael@0 40 /**
michael@0 41 * nsITheme is a service that provides platform-specific native
michael@0 42 * rendering for widgets. In other words, it provides the necessary
michael@0 43 * operations to draw a rendering object (an nsIFrame) as a native
michael@0 44 * widget.
michael@0 45 *
michael@0 46 * All the methods on nsITheme take a rendering context or device
michael@0 47 * context, a frame (the rendering object), and a widget type (one of
michael@0 48 * the constants in nsThemeConstants.h).
michael@0 49 */
michael@0 50 class nsITheme: public nsISupports {
michael@0 51 public:
michael@0 52 NS_DECLARE_STATIC_IID_ACCESSOR(NS_ITHEME_IID)
michael@0 53
michael@0 54 /**
michael@0 55 * Draw the actual theme background.
michael@0 56 * @param aContext the context to draw into
michael@0 57 * @param aFrame the frame for the widget that we're drawing
michael@0 58 * @param aWidgetType the -moz-appearance value to draw
michael@0 59 * @param aRect the rectangle defining the area occupied by the widget
michael@0 60 * @param aDirtyRect the rectangle that needs to be drawn
michael@0 61 */
michael@0 62 NS_IMETHOD DrawWidgetBackground(nsRenderingContext* aContext,
michael@0 63 nsIFrame* aFrame,
michael@0 64 uint8_t aWidgetType,
michael@0 65 const nsRect& aRect,
michael@0 66 const nsRect& aDirtyRect) = 0;
michael@0 67
michael@0 68 /**
michael@0 69 * Get the computed CSS border for the widget, in pixels.
michael@0 70 */
michael@0 71 NS_IMETHOD GetWidgetBorder(nsDeviceContext* aContext,
michael@0 72 nsIFrame* aFrame,
michael@0 73 uint8_t aWidgetType,
michael@0 74 nsIntMargin* aResult)=0;
michael@0 75
michael@0 76 /**
michael@0 77 * This method can return false to indicate that the CSS padding
michael@0 78 * value should be used. Otherwise, it will fill in aResult with the
michael@0 79 * computed padding, in pixels, and return true.
michael@0 80 *
michael@0 81 * XXXldb This ought to be required to return true for non-containers
michael@0 82 * so that we don't let specified padding that has no effect change
michael@0 83 * the computed padding and potentially the size.
michael@0 84 */
michael@0 85 virtual bool GetWidgetPadding(nsDeviceContext* aContext,
michael@0 86 nsIFrame* aFrame,
michael@0 87 uint8_t aWidgetType,
michael@0 88 nsIntMargin* aResult) = 0;
michael@0 89
michael@0 90 /**
michael@0 91 * On entry, *aResult is positioned at 0,0 and sized to the new size
michael@0 92 * of aFrame (aFrame->GetSize() may be stale and should not be used).
michael@0 93 * This method can return false to indicate that no special
michael@0 94 * overflow area is required by the native widget. Otherwise it will
michael@0 95 * fill in aResult with the desired overflow area, in appunits, relative
michael@0 96 * to the frame origin, and return true.
michael@0 97 *
michael@0 98 * This overflow area is used to determine what area needs to be
michael@0 99 * repainted when the widget changes. However, it does not affect the
michael@0 100 * widget's size or what area is reachable by scrollbars. (In other
michael@0 101 * words, in layout terms, it affects visual overflow but not
michael@0 102 * scrollable overflow.)
michael@0 103 */
michael@0 104 virtual bool GetWidgetOverflow(nsDeviceContext* aContext,
michael@0 105 nsIFrame* aFrame,
michael@0 106 uint8_t aWidgetType,
michael@0 107 /*INOUT*/ nsRect* aOverflowRect)
michael@0 108 { return false; }
michael@0 109
michael@0 110 /**
michael@0 111 * Get the minimum border-box size of a widget, in *pixels* (in
michael@0 112 * |aResult|). If |aIsOverridable| is set to true, this size is a
michael@0 113 * minimum size; if false, this size is the only valid size for the
michael@0 114 * widget.
michael@0 115 */
michael@0 116 NS_IMETHOD GetMinimumWidgetSize(nsRenderingContext* aContext,
michael@0 117 nsIFrame* aFrame,
michael@0 118 uint8_t aWidgetType,
michael@0 119 nsIntSize* aResult,
michael@0 120 bool* aIsOverridable)=0;
michael@0 121
michael@0 122
michael@0 123 enum Transparency {
michael@0 124 eOpaque = 0,
michael@0 125 eTransparent,
michael@0 126 eUnknownTransparency
michael@0 127 };
michael@0 128
michael@0 129 /**
michael@0 130 * Returns what we know about the transparency of the widget.
michael@0 131 */
michael@0 132 virtual Transparency GetWidgetTransparency(nsIFrame* aFrame, uint8_t aWidgetType)
michael@0 133 { return eUnknownTransparency; }
michael@0 134
michael@0 135 NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, uint8_t aWidgetType,
michael@0 136 nsIAtom* aAttribute, bool* aShouldRepaint)=0;
michael@0 137
michael@0 138 NS_IMETHOD ThemeChanged()=0;
michael@0 139
michael@0 140 virtual bool WidgetAppearanceDependsOnWindowFocus(uint8_t aWidgetType)
michael@0 141 { return false; }
michael@0 142
michael@0 143 /**
michael@0 144 * Can the nsITheme implementation handle this widget?
michael@0 145 */
michael@0 146 virtual bool ThemeSupportsWidget(nsPresContext* aPresContext,
michael@0 147 nsIFrame* aFrame,
michael@0 148 uint8_t aWidgetType)=0;
michael@0 149
michael@0 150 virtual bool WidgetIsContainer(uint8_t aWidgetType)=0;
michael@0 151
michael@0 152 /**
michael@0 153 * Does the nsITheme implementation draw its own focus ring for this widget?
michael@0 154 */
michael@0 155 virtual bool ThemeDrawsFocusForWidget(uint8_t aWidgetType)=0;
michael@0 156
michael@0 157 /**
michael@0 158 * Should we insert a dropmarker inside of combobox button?
michael@0 159 */
michael@0 160 virtual bool ThemeNeedsComboboxDropmarker()=0;
michael@0 161
michael@0 162 /**
michael@0 163 * Should we hide scrollbars?
michael@0 164 */
michael@0 165 virtual bool ShouldHideScrollbars()
michael@0 166 { return false; }
michael@0 167 };
michael@0 168
michael@0 169 NS_DEFINE_STATIC_IID_ACCESSOR(nsITheme, NS_ITHEME_IID)
michael@0 170
michael@0 171 // Creator function
michael@0 172 extern nsresult NS_NewNativeTheme(nsISupports *aOuter, REFNSIID aIID, void **aResult);
michael@0 173
michael@0 174 #endif

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