widget/nsNativeBasicThemeAndroid.cpp

   1 /* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsNativeBasicThemeAndroid.h"
   7
   8 #include "mozilla/ClearOnShutdown.h"
   9 #include "nsStyleConsts.h"
  10 #include "nsIFrame.h"
  11
  12 auto nsNativeBasicThemeAndroid::GetScrollbarSizes(nsPresContext* aPresContext,
  13                                                   StyleScrollbarWidth aWidth,
  14                                                   Overlay aOverlay)
  15     -> ScrollbarSizes {
  16   // We force auto-width scrollbars because scrollbars on android are already
  17   // thin enough.
  18   return nsNativeBasicTheme::GetScrollbarSizes(
  19       aPresContext, StyleScrollbarWidth::Auto, aOverlay);
  20 }
  21
  22 NS_IMETHODIMP
  23 nsNativeBasicThemeAndroid::GetMinimumWidgetSize(
  24     nsPresContext* aPresContext, nsIFrame* aFrame, StyleAppearance aAppearance,
  25     mozilla::LayoutDeviceIntSize* aResult, bool* aIsOverridable) {
  26   if (!IsWidgetScrollbarPart(aAppearance)) {
  27     return nsNativeBasicTheme::GetMinimumWidgetSize(
  28         aPresContext, aFrame, aAppearance, aResult, aIsOverridable);
  29   }
  30
  31   auto sizes =
  32       GetScrollbarSizes(aPresContext, StyleScrollbarWidth::Auto, Overlay::Yes);
  33   aResult->SizeTo(sizes.mHorizontal, sizes.mHorizontal);
  34   MOZ_ASSERT(sizes.mHorizontal == sizes.mVertical);
  35
  36   *aIsOverridable = true;
  37   return NS_OK;
  38 }
  39
  40 template <typename PaintBackendData>
  41 void nsNativeBasicThemeAndroid::DoPaintScrollbarThumb(
  42     PaintBackendData& aPaintData, const LayoutDeviceRect& aRect,
  43     bool aHorizontal, nsIFrame* aFrame, const ComputedStyle& aStyle,
  44     const EventStates& aElementState, const EventStates& aDocumentState,
  45     const Colors& aColors, DPIRatio aDpiRatio) {
  46   // TODO(emilio): Maybe do like macOS and draw a stroke?
  47   const auto color = ComputeScrollbarThumbColor(aFrame, aStyle, aElementState,
  48                                                 aDocumentState, aColors);
  49
  50   // Draw the thumb rect centered in the scrollbar.
  51   LayoutDeviceRect thumbRect(aRect);
  52   if (aHorizontal) {
  53     thumbRect.height *= 0.5f;
  54     thumbRect.y += thumbRect.height * 0.5f;
  55   } else {
  56     thumbRect.width *= 0.5f;
  57     thumbRect.x += thumbRect.width * 0.5f;
  58   }
  59
  60   const LayoutDeviceCoord radius =
  61       (aHorizontal ? thumbRect.height : thumbRect.width) / 2.0f;
  62   PaintRoundedRectWithRadius(aPaintData, thumbRect, color,
  63                              sRGBColor::White(0.0f), 0.0f, radius / aDpiRatio,
  64                              aDpiRatio);
  65 }
  66
  67 bool nsNativeBasicThemeAndroid::PaintScrollbarThumb(
  68     DrawTarget& aDt, const LayoutDeviceRect& aRect, bool aHorizontal,
  69     nsIFrame* aFrame, const ComputedStyle& aStyle,
  70     const EventStates& aElementState, const EventStates& aDocumentState,
  71     const Colors& aColors, DPIRatio aDpiRatio) {
  72   DoPaintScrollbarThumb(aDt, aRect, aHorizontal, aFrame, aStyle, aElementState,
  73                         aDocumentState, aColors, aDpiRatio);
  74   return true;
  75 }
  76
  77 bool nsNativeBasicThemeAndroid::PaintScrollbarThumb(
  78     WebRenderBackendData& aWrData, const LayoutDeviceRect& aRect,
  79     bool aHorizontal, nsIFrame* aFrame, const ComputedStyle& aStyle,
  80     const EventStates& aElementState, const EventStates& aDocumentState,
  81     const Colors& aColors, DPIRatio aDpiRatio) {
  82   DoPaintScrollbarThumb(aWrData, aRect, aHorizontal, aFrame, aStyle,
  83                         aElementState, aDocumentState, aColors, aDpiRatio);
  84   return true;
  85 }
  86
  87 already_AddRefed<nsITheme> do_GetAndroidNonNativeThemeDoNotUseDirectly() {
  88   static mozilla::StaticRefPtr<nsITheme> gInstance;
  89   if (MOZ_UNLIKELY(!gInstance)) {
  90     gInstance = new nsNativeBasicThemeAndroid();
  91     ClearOnShutdown(&gInstance);
  92   }
  93   return do_AddRef(gInstance);
  94 }
  95
  96
  97 #ifdef ANDROID
  98 already_AddRefed<nsITheme> do_GetBasicNativeThemeDoNotUseDirectly() {
  99   return do_GetAndroidNonNativeThemeDoNotUseDirectly();
 100 }
 101
 102 already_AddRefed<nsITheme> do_GetNativeThemeDoNotUseDirectly() {
 103   // Android doesn't have a native theme.
 104   return do_GetBasicNativeThemeDoNotUseDirectly();
 105 }
 106 #endif