初版-带一个进度条

sources/LayeredWindow.cpp

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+#include "LayeredWindow.h"
+
+namespace ezui {
+
+	std::vector<LayeredWindow*> g_layeredWnds;
+	Timer g_layeredWndTimer;
+
+	//WS_EX_LAYERED | WS_EX_NOACTIVATE | WS_EX_TRANSPARENT
+	LayeredWindow::LayeredWindow(int width, int height, HWND owner, DWORD dwStyle, DWORD dwExStyle) :BorderlessWindow(width, height, owner, dwStyle, dwExStyle | WS_EX_LAYERED)
+	{
+		//初始化全局绘制计时器
+		if (g_layeredWndTimer.Tick == NULL) {
+			g_layeredWndTimer.Interval = 5;
+			g_layeredWndTimer.Tick = [](Timer* t) {
+				t->Stop();
+				Invoke([]() {
+					for (auto& it : g_layeredWnds) {
+						it->Paint();
+					}
+					});
+				};
+		}
+		//添加到全局绘制队列
+		g_layeredWnds.push_back(this);
+		//获取公共数据
+		auto* publicData = this->GetPublicData();
+		publicData->InvalidateRect = [this](const Rect& rect) ->void {
+			//标记窗口无效区域
+			this->InvalidateRect(rect);
+			};
+		publicData->Refresh = [this]()->void {
+			//立即更新窗口中的无效区域
+			this->Paint();
+			};
+		//获取客户区大小 创建一个位图给窗口绘制
+		Size sz = GetClientRect().GetSize();
+		m_winBitmap = new Bitmap(sz.Width, sz.Height);
+	}
+	LayeredWindow::~LayeredWindow() {
+		if (m_winBitmap) {
+			delete m_winBitmap;
+		}
+		//从全局中移除
+		auto itor = std::find(g_layeredWnds.begin(), g_layeredWnds.end(), this);
+		if (itor != g_layeredWnds.end()) {
+			g_layeredWnds.erase(itor);
+		}
+	}
+
+	void LayeredWindow::InvalidateRect(const Rect& _rect) {
+		//将此区域添加到无效区域
+		m_invalidateRect.push_back(_rect);
+		//timer延迟绘制
+		g_layeredWndTimer.Start();
+	}
+
+	void LayeredWindow::BeginPaint(Rect* out_rect)
+	{
+		const Rect& clientRect = GetClientRect();
+		int Width = clientRect.Width;
+		int Height = clientRect.Height;
+		//将所有无效区域并集
+		for (auto& it : m_invalidateRect) {
+			Rect rect = it;
+			//这段代码是保证重绘区域一定是在窗口内
+			if (rect.X < 0) {
+				rect.Width += rect.X;
+				rect.X = 0;
+				if (rect.Width < 0) rect.Width = 0;
+			}
+			if (rect.Y < 0) {
+				rect.Height += rect.Y;
+				rect.Y = 0;
+				if (rect.Height < 0) rect.Height = 0;
+			}
+			if (rect.GetRight() > Width) {
+				rect.Width = Width - rect.X;
+				if (rect.Width < 0) rect.Width = 0;
+			}
+			if (rect.GetBottom() > Height) {
+				rect.Height = Height - rect.Y;
+				if (rect.Height < 0) rect.Height = 0;
+			}
+			//并集
+			Rect::Union(*out_rect, *out_rect, rect);
+		}
+	}
+	void LayeredWindow::EndPaint()
+	{
+		m_invalidateRect.clear();
+	}
+	void LayeredWindow::Paint()
+	{
+		if (IsVisible()) {
+			Rect invalidateRect;
+			BeginPaint(&invalidateRect);
+			if ((m_winBitmap && !invalidateRect.IsEmptyArea())) {
+				m_winBitmap->Earse(invalidateRect);//清除背景
+				HDC winHDC = m_winBitmap->GetDC();
+#if 1
+				//不使用双缓冲
+				DoPaint(winHDC, invalidateRect);
+#else
+				//使用双缓冲
+				Bitmap doubleBuff(m_winBitmap->Width(), m_winBitmap->Height());
+				DoPaint(doubleBuff.GetHDC(), invalidateRect);
+				//使用BitBlt函数进行复制到winHDC  //如果窗体不规则 不适用于BitBlt进行复制
+				::BitBlt(winHDC, invalidateRect.X, invalidateRect.Y,
+					invalidateRect.Width, invalidateRect.Height,
+					doubleBuff.GetHDC(), invalidateRect.X, invalidateRect.Y,
+					SRCCOPY);
+#endif
+				UpdateLayeredWindow(winHDC);//updatelaredwindow 更新窗口
+				EndPaint();
+			}
+		}
+	}
+	LRESULT LayeredWindow::WndProc(UINT uMsg, WPARAM wParam, LPARAM lParam)
+	{
+		switch (uMsg)
+		{
+		default:
+			break;
+		}
+		return __super::WndProc(uMsg, wParam, lParam);
+	}
+	void LayeredWindow::OnSize(const Size& sz) {
+		__super::OnSize(sz);
+		if (m_winBitmap) {
+			delete m_winBitmap;
+		}
+		m_winBitmap = new Bitmap(sz.Width, sz.Height);
+		Invalidate();
+	}
+
+	void LayeredWindow::UpdateLayeredWindow(HDC hdc) {
+		const Rect& _rectClient = GetClientRect();
+		POINT point{ _rectClient.X,_rectClient.Y };
+		SIZE size{ _rectClient.Width,  _rectClient.Height };
+		BLENDFUNCTION blendFunc{ 0 };
+		blendFunc.SourceConstantAlpha = 255 * this->Opacity;
+		blendFunc.BlendOp = AC_SRC_OVER;
+		blendFunc.AlphaFormat = AC_SRC_ALPHA;
+		blendFunc.BlendFlags = 0;
+		::UpdateLayeredWindow(Hwnd(), NULL, NULL, &size, hdc, &point, 0, &blendFunc, ULW_ALPHA);//透明
+	}
+}