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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/shell/renderer/test_runner/WebTestThemeEngineMac.h"
      6 
      7 #import <AppKit/NSAffineTransform.h>
      8 #import <AppKit/NSGraphicsContext.h>
      9 #import <AppKit/NSScroller.h>
     10 #import <AppKit/NSWindow.h>
     11 #include <Carbon/Carbon.h>
     12 #include "skia/ext/skia_utils_mac.h"
     13 #include "third_party/WebKit/public/platform/WebCanvas.h"
     14 #include "third_party/WebKit/public/platform/WebRect.h"
     15 
     16 using blink::WebCanvas;
     17 using blink::WebRect;
     18 using blink::WebThemeEngine;
     19 
     20 // We can't directly tell the NSScroller to draw itself as active or inactive,
     21 // instead we have to make it a child of an (in)active window. This class lets
     22 // us fake that parent window.
     23 @interface FakeActiveWindow : NSWindow {
     24 @private
     25     BOOL hasActiveControls;
     26 }
     27 + (NSWindow*)alwaysActiveWindow;
     28 + (NSWindow*)alwaysInactiveWindow;
     29 - (id)initWithActiveControls:(BOOL)_hasActiveControls;
     30 - (BOOL)_hasActiveControls;
     31 @end
     32 
     33 @implementation FakeActiveWindow
     34 
     35 static NSWindow* alwaysActiveWindow = nil;
     36 static NSWindow* alwaysInactiveWindow = nil;
     37 
     38 + (NSWindow*)alwaysActiveWindow
     39 {
     40     if (alwaysActiveWindow == nil)
     41         alwaysActiveWindow = [[self alloc] initWithActiveControls:YES];
     42     return alwaysActiveWindow;
     43 }
     44 
     45 + (NSWindow*)alwaysInactiveWindow
     46 {
     47     if (alwaysInactiveWindow == nil)
     48         alwaysInactiveWindow = [[self alloc] initWithActiveControls:NO];
     49     return alwaysInactiveWindow;
     50 }
     51 
     52 - (id)initWithActiveControls:(BOOL)_hasActiveControls
     53 {
     54     if ((self = [super initWithContentRect:NSMakeRect(0, 0, 100, 100)
     55                                  styleMask:0
     56                                    backing:NSBackingStoreBuffered
     57                                      defer:YES])) {
     58         hasActiveControls = _hasActiveControls;
     59     }
     60     return self;
     61 }
     62 
     63 - (BOOL)_hasActiveControls
     64 {
     65     return hasActiveControls;
     66 }
     67 
     68 @end
     69 
     70 namespace content {
     71 
     72 namespace {
     73 
     74 ThemeTrackEnableState stateToHIEnableState(WebThemeEngine::State state)
     75 {
     76     switch (state) {
     77     case WebThemeEngine::StateDisabled:
     78         return kThemeTrackDisabled;
     79     case WebThemeEngine::StateInactive:
     80         return kThemeTrackInactive;
     81     default:
     82         return kThemeTrackActive;
     83     }
     84 }
     85 
     86 }  // namespace
     87 
     88 void WebTestThemeEngineMac::paintScrollbarThumb(
     89     WebCanvas* canvas,
     90     WebThemeEngine::State state,
     91     WebThemeEngine::Size size,
     92     const WebRect& rect,
     93     const WebThemeEngine::ScrollbarInfo& scrollbarInfo)
     94 {
     95     // To match the Mac port, we still use HITheme for inner scrollbars.
     96     if (scrollbarInfo.parent == WebThemeEngine::ScrollbarParentRenderLayer)
     97         paintHIThemeScrollbarThumb(canvas, state, size, rect, scrollbarInfo);
     98     else
     99         paintNSScrollerScrollbarThumb(canvas, state, size, rect, scrollbarInfo);
    100 }
    101 
    102 // Duplicated from webkit/glue/webthemeengine_impl_mac.cc in the downstream
    103 // Chromium WebThemeEngine implementation.
    104 void WebTestThemeEngineMac::paintHIThemeScrollbarThumb(
    105     WebCanvas* canvas,
    106     WebThemeEngine::State state,
    107     WebThemeEngine::Size size,
    108     const WebRect& rect,
    109     const WebThemeEngine::ScrollbarInfo& scrollbarInfo)
    110 {
    111     HIThemeTrackDrawInfo trackInfo;
    112     trackInfo.version = 0;
    113     trackInfo.kind = size == WebThemeEngine::SizeRegular ? kThemeMediumScrollBar : kThemeSmallScrollBar;
    114     trackInfo.bounds = CGRectMake(rect.x, rect.y, rect.width, rect.height);
    115     trackInfo.min = 0;
    116     trackInfo.max = scrollbarInfo.maxValue;
    117     trackInfo.value = scrollbarInfo.currentValue;
    118     trackInfo.trackInfo.scrollbar.viewsize = scrollbarInfo.visibleSize;
    119     trackInfo.attributes = 0;
    120     if (scrollbarInfo.orientation == WebThemeEngine::ScrollbarOrientationHorizontal)
    121         trackInfo.attributes |= kThemeTrackHorizontal;
    122 
    123     trackInfo.enableState = stateToHIEnableState(state);
    124 
    125     trackInfo.trackInfo.scrollbar.pressState =
    126         state == WebThemeEngine::StatePressed ? kThemeThumbPressed : 0;
    127     trackInfo.attributes |= (kThemeTrackShowThumb | kThemeTrackHideTrack);
    128     gfx::SkiaBitLocker bitLocker(canvas);
    129     CGContextRef cgContext = bitLocker.cgContext();
    130     HIThemeDrawTrack(&trackInfo, 0, cgContext, kHIThemeOrientationNormal);
    131 }
    132 
    133 void WebTestThemeEngineMac::paintNSScrollerScrollbarThumb(
    134     WebCanvas* canvas,
    135     WebThemeEngine::State state,
    136     WebThemeEngine::Size size,
    137     const WebRect& rect,
    138     const WebThemeEngine::ScrollbarInfo& scrollbarInfo)
    139 {
    140     [NSGraphicsContext saveGraphicsState];
    141     NSScroller* scroller = [[NSScroller alloc] initWithFrame:NSMakeRect(rect.x, rect.y, rect.width, rect.height)];
    142     [scroller setEnabled:state != WebThemeEngine::StateDisabled];
    143     if (state == WebThemeEngine::StateInactive)
    144         [[[FakeActiveWindow alwaysInactiveWindow] contentView] addSubview:scroller];
    145     else
    146         [[[FakeActiveWindow alwaysActiveWindow] contentView] addSubview:scroller];
    147 
    148     [scroller setControlSize:size == WebThemeEngine::SizeRegular ? NSRegularControlSize : NSSmallControlSize];
    149 
    150     double value = double(scrollbarInfo.currentValue) / double(scrollbarInfo.maxValue);
    151     [scroller setDoubleValue: value];
    152 
    153     float knobProportion = float(scrollbarInfo.visibleSize) / float(scrollbarInfo.totalSize);
    154     [scroller setKnobProportion: knobProportion];
    155 
    156     gfx::SkiaBitLocker bitLocker(canvas);
    157     CGContextRef cgContext = bitLocker.cgContext();
    158     NSGraphicsContext* nsGraphicsContext = [NSGraphicsContext graphicsContextWithGraphicsPort:cgContext flipped:YES];
    159     [NSGraphicsContext setCurrentContext:nsGraphicsContext];
    160 
    161     // Despite passing in frameRect() to the scroller, it always draws at (0, 0).
    162     // Force it to draw in the right location by translating the whole graphics
    163     // context.
    164     CGContextSaveGState(cgContext);
    165     NSAffineTransform *transform = [NSAffineTransform transform];
    166     [transform translateXBy:rect.x yBy:rect.y];
    167     [transform concat];
    168 
    169     [scroller drawKnob];
    170     CGContextRestoreGState(cgContext);
    171 
    172     [scroller release];
    173 
    174     [NSGraphicsContext restoreGraphicsState];
    175 }
    176 
    177 }  // namespace content
    178