自从我发现Windows XP开始就支持Windows Image Component之后，我发现读取图片这个问题瞬间就变简单了。因此我给GacUI添加了绘制图片的功能，并做了一个小小的GIF动画demo。代码仍然更新在了
Vczh Library++3.0上的Candidate\GUI\GUIDemo\GUIDemo.sln上。F5可以直接运行，不过如果要双击打开exe的话，则要把GUIDemo\Resources目录复制到exe目录下。下面的效果图展示了一个GIF动画上覆盖若干个带有alpha通道的png图片：
（实际效果是会动的）
因为GacUI试图隔离Windows API的所有信息，以便可以让程序员自由添加对操作系统（Windows或其他）和渲染技术（GDI、Direct2D或其他）的支持，因此我不得不暂时封装了一下。现在的这个接口只能读，不能做一些高级操作，以后会添加上。使用GacUI编写上述Demo的代码如下（具体实现可以去下载并阅读）：
1 #include "..\..\GUI\GacUI.h"
2
3 GuiBoundsComposition* CreateImageFrame(Ptr<INativeImage> image, int frameIndex=0)
4 {
5 GuiImageFrameElement* element=GuiImageFrameElement::Create();
6 element->SetImage(image, frameIndex);
7
8 GuiBoundsComposition* composition=new GuiBoundsComposition;
9 composition->SetOwnedElement(element);
10 composition->SetMinSizeLimitation(GuiGraphicsComposition::LimitToElement);
11 return composition;
12 }
13
14 class GifAnimation : public Object, public IGuiGraphicsAnimation
15 {
16 protected:
17 unsigned __int64 startTime;
18 GuiImageFrameElement* element;
19 public:
20 GifAnimation(GuiImageFrameElement* _element)
21 :element(_element)
22 ,startTime(DateTime::LocalTime().totalMilliseconds)
23 {
24 }
25
26 int GetTotalLength()
27 {
28 return 1;
29 }
30
31 int GetCurrentPosition()
32 {
33 return 0;
34 }
35
36 void Play(int currentPosition, int totalLength)
37 {
38 unsigned __int64 ms=DateTime::LocalTime().totalMilliseconds-startTime;
39 int frameIndex=(ms/100)%element->GetImage()->GetFrameCount();
40 element->SetImage(element->GetImage(), frameIndex);
41 }
42
43 void Stop()
44 {
45 }
46 };
47
48 void SetupGifWindow(GuiControlHost* host)
49 {
50 host->GetBoundsComposition()->SetMinSizeLimitation(GuiGraphicsComposition::LimitToElementAndChildren);
51 INativeImageProvider* imageProvider=GetCurrentController()->GetImageProvider();
52 Ptr<INativeImage> imageNew=imageProvider->CreateImageFromFile(L"Resources\\New.png");
53 Ptr<INativeImage> imageOpen=imageProvider->CreateImageFromFile(L"Resources\\Open.png");
54 Ptr<INativeImage> imageSave=imageProvider->CreateImageFromFile(L"Resources\\Save.png");
55 Ptr<INativeImage> imageGif=imageProvider->CreateImageFromFile(L"Resources\\Gif.gif");
56
57 GuiBoundsComposition* image1=CreateImageFrame(imageNew);
58 GuiBoundsComposition* image2=CreateImageFrame(imageOpen);
59 GuiBoundsComposition* image3=CreateImageFrame(imageSave);
60 GuiBoundsComposition* image4=CreateImageFrame(imageGif);
61
62 host->GetContainerComposition()->AddChild(image4);
63 host->GetContainerComposition()->AddChild(image1);
64 host->GetContainerComposition()->AddChild(image2);
65 host->GetContainerComposition()->AddChild(image3);
66
67 image1->SetBounds(Rect(Point(10, 10), imageNew->GetFrame(0)->GetSize()));
68 image2->SetBounds(Rect(Point(50, 10), imageOpen->GetFrame(0)->GetSize()));
69 image3->SetBounds(Rect(Point(90, 10), imageSave->GetFrame(0)->GetSize()));
70
71 Ptr<GifAnimation> animation=new GifAnimation(image4->GetOwnedElement().Cast<GuiImageFrameElement>().Obj());
72 host->GetGraphicsHost()->GetAnimationManager()->AddAnimation(animation);
73 }
74
75 /***********************************************************************
76 GuiMain
77 ***********************************************************************/
78
79 void GuiMain()
80 {
81 INativeWindow* window=GetCurrentController()->CreateNativeWindow();
82 #ifdef GUI_GRAPHICS_RENDERER_GDI
83 window->SetTitle(L"Vczh GUI Demo (GDI)");
84 #endif
85 #ifdef GUI_GRAPHICS_RENDERER_DIRECT2D
86 window->SetTitle(L"Vczh GUI Demo (Direct2D)");
87 #endif
88 window->SetClientSize(Size(800, 600));
89
90 INativeScreen* screen=GetCurrentController()->GetScreen(window);
91 Rect windowBounds=window->GetBounds();
92 Rect screenBounds=screen->GetClientBounds();
93 window->SetBounds(Rect(
94 Point(
95 screenBounds.Left()+(screenBounds.Width()-windowBounds.Width())/2,
96 screenBounds.Top()+(screenBounds.Height()-windowBounds.Height())/2
97 ),
98 windowBounds.GetSize()
99 ));
100
101 GuiControlHost host(new win7::Win7WindowStyle);
102 SetupGifWindow(&host);
103 host.SetNativeWindow(window);
104
105 GetCurrentController()->Run(window);
106 }
posted on 2011-11-06 01:00
陈梓瀚(vczh) 阅读(2232)
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