Duilib的圆环形 进度条 实现（网易云信版本）

/** @file CircleProgress.h
* @brief 圆环型进度条控件，圆环中间可以有文本（如85%）
* @copyright (c) 2019-2022, NetEase Inc. All rights reserved
* @author Xuhuajie
* @date 2019/8/14
*/

#ifndef UI_CONTROL_CIRCLEPROGRESS_H_
#define UI_CONTROL_CIRCLEPROGRESS_H_

#pragma once

namespace ui
{

class UILIB_API CircleProgress : public Progress
{
public:
CircleProgress();

/// 重写父类方法，提供个性化功能，请参考父类声明
virtual void SetAttribute(const std::wstring& strName, const std::wstring& strValue) override;
virtual void PaintStatusImage(IRenderContext* pRender) override;
virtual void ClearImageCache() override;

/**
* @brief 设置圆形进度条
* @param[in] bCircular 为 true 时设置为圆形滚动条，false 时设置为父级滚动条，默认为 true
* @return 无
*/
void SetCircular(bool bCircular = true);
/**
* @brief 设置递增方向
* @param[in] bClockwise 为 true 时设置为顺时针，false 时设置为逆时针，默认为 true
* @return 无
*/
void SetClockwiseRotation(bool bClockwise = true);
/**
* @brief 设置圆环宽度
* @param[in] nCircleWidth 宽度数值
* @return 无
*/
void SetCircleWidth(int nCircleWidth);
/**
* @brief 设置进度条背景颜色
* @param[in] strColor要设置的背景颜色字符串，该字符串必须在 global.xml 中存在
* @return 无
*/
void SetBackgroudColor(const std::wstring& strColor);
/**
* @brief 设置进度条前景颜色
* @param[in] strColor要设置的前景颜色字符串，该字符串必须在 global.xml 中存在
* @return 无
*/
void SetForegroudColor(const std::wstring& strColor);
/**
* @brief 设置进度条前景渐变颜色，与ForegroudColor同时使用，可以不设置,则无渐变效果
* @param[in] strColor要设置的前景渐变颜色字符串，该字符串必须在 global.xml 中存在
* @return 无
*/
void SetCircleGradientColor(const std::wstring& strColor);
/**
* @brief 设置进度指示移动图标
* @param[in] sIndicatorImage要设置的图片
* @return 无
*/
void SetIndicator(const std::wstring& sIndicatorImage);

protected:
bool m_bCircular;
bool m_bClockwise;
int m_nCircleWidth;
DWORD m_dwBackgroundColor;
DWORD m_dwForegroundColor;
DWORD m_dwGradientColor;
//Image m_IndicatorImage; //使用image对象，无法满足需求，需要设置矩阵变换
Gdiplus::Image* m_pIndicator; //此类目前维护资源管理
std::wstring m_sIndicatorImage;

};

} // namespace ui

#endif // UI_CONTROL_CIRCLEPROGRESS_H_

/** @file CircleProgress.cpp
* @brief 圆环型滚动条控件，圆环中间可以有文本（如85%）
* @copyright (c) 2019-2022, NetEase Inc. All rights reserved
* @author Xuhuajie
* @date 2019/8/14
*/

#include "stdafx.h"
#include "CircleProgress.h"
#include "shlwapi.h"

namespace ui
{
CircleProgress::CircleProgress() :
m_bCircular(true),
m_bClockwise(true),
m_nCircleWidth(1),
m_dwBackgroundColor(0),
m_dwForegroundColor(0),
m_dwGradientColor(0),
m_pIndicator(nullptr)
{

}

void CircleProgress::SetAttribute(const std::wstring& srName, const std::wstring& strValue)
{
if (srName == _T("circular")) SetCircular(strValue == _T("true"));
else if (srName == _T("circlewidth")) SetCircleWidth(_ttoi(strValue.c_str()));
else if (srName == _T("indicator")) SetIndicator(strValue);
else if (srName == _T("clockwise")) SetClockwiseRotation(strValue == _T("true"));
else if (srName == _T("bgcolor")) {
LPCTSTR pValue = strValue.c_str();
while (*pValue > _T('') && *pValue <= _T(' ')) pValue = ::CharNext(pValue);
SetBackgroudColor(pValue);
}
else if (srName == _T("fgcolor")) {
LPCTSTR pValue = strValue.c_str();
while (*pValue > _T('') && *pValue <= _T(' ')) pValue = ::CharNext(pValue);
SetForegroudColor(pValue);
}
else if (srName == _T("gradientcolor")) {
LPCTSTR pValue = strValue.c_str();
while (*pValue > _T('') && *pValue <= _T(' ')) pValue = ::CharNext(pValue);
SetCircleGradientColor(pValue);
}
else Progress::SetAttribute(srName, strValue);
}

void CircleProgress::PaintStatusImage(IRenderContext* pRender)
{
Progress::PaintStatusImage(pRender);
if (m_bCircular)
{
//目前IRenderContext还有很多GDI+接口未实现，暂时直接用gdi+画图了
//以后可能会调整：需实现1、DrawArc 2、Pen增加brush(渐变)入参 3、可以自由设置Graphics属性
int direction = m_bClockwise ? 1 : -1; //旋转方向
int bordersize = 1; //弧度宽度目前使用1像素

Gdiplus::Graphics graphics(pRender->GetDC());
graphics.SetSmoothingMode(Gdiplus::SmoothingModeAntiAlias);
Gdiplus::Pen bgPen(m_dwBackgroundColor, m_nCircleWidth);
// 圆形中心
CPoint center;
center.x = m_rcItem.left + (m_rcItem.right - m_rcItem.left) / 2;
center.y = m_rcItem.top + (m_rcItem.bottom - m_rcItem.top) / 2;

// 控件矩形内的最大正方形的边界
int side = min(m_rcItem.right - m_rcItem.left, m_rcItem.bottom - m_rcItem.top);
//UiRect rcBorder; 仍然存在UiRect 到 RectF的转换，所以直接用gdi的RectF了
Gdiplus::RectF rcBorder;
rcBorder.X = center.x - side / 2;
rcBorder.Y = center.y - side / 2;
rcBorder.Width = rcBorder.Height = side;

Gdiplus::RectF outer = rcBorder;
if (m_pIndicator) {
outer.Inflate(-1.0F *m_pIndicator->GetWidth() / 2, -1.0F * m_pIndicator->GetWidth() / 2);
}
else
{
outer.Inflate(-0.5 * m_nCircleWidth, -0.5 * m_nCircleWidth);
}
outer.Inflate(-1, -1);

if (m_dwGradientColor == 0)
{
//不使用渐变色，直接用前景色铺满
Gdiplus::Pen fgPen(m_dwForegroundColor, m_nCircleWidth);
graphics.DrawArc(&bgPen, outer, 270, 360); //270从最上面开始递增，设为0的话，是最右边开始
graphics.DrawArc(&fgPen, outer, 270, direction * 360 * (m_nValue - m_nMin) / (m_nMax - m_nMin));
}
else
{
Gdiplus::REAL factors[4] = { 0.0f, 0.4f, 0.6f, 1.0f };
Gdiplus::REAL positions[4] = { 0.0f, 0.2f, 0.8f, 1.0f };

Gdiplus::LinearGradientBrush lgbrush(rcBorder, m_dwForegroundColor, m_dwGradientColor, Gdiplus::LinearGradientModeVertical);
lgbrush.SetBlend(factors, positions, 4);
graphics.DrawArc(&bgPen, outer, 270, 360);
Gdiplus::Pen fgPen(&lgbrush, m_nCircleWidth);
graphics.DrawArc(&fgPen, outer, 270, direction * 360 * (m_nValue - m_nMin) / (m_nMax - m_nMin));

}

//画旋转指示器图标，需要用到矩阵
if (m_pIndicator)
{
Gdiplus::Matrix matrix;
matrix.RotateAt(direction * 360 * (m_nValue - m_nMin) / (m_nMax - m_nMin), Gdiplus::PointF(center.x, center.y), Gdiplus::MatrixOrderAppend);
graphics.SetTransform(&matrix);
Gdiplus::RectF rectf;
rectf.X = center.x - m_pIndicator->GetWidth() / 2;
rectf.Y = outer.Y + bordersize / 2 -m_pIndicator->GetHeight() / 2;
rectf.Width = m_pIndicator->GetWidth();
rectf.Height = m_pIndicator->GetHeight();
graphics.DrawImage(m_pIndicator, rectf);
}

}
}

void CircleProgress::ClearImageCache()
{
__super::ClearImageCache();
if (m_pIndicator)
{
delete m_pIndicator;
m_pIndicator = nullptr;
}
}

void CircleProgress::SetCircular(bool bCircular /*= true*/)
{
m_bCircular = bCircular;
Invalidate();
}

void CircleProgress::SetClockwiseRotation(bool bClockwise /*= true*/)
{
if (bClockwise != m_bClockwise)
{
m_bClockwise = bClockwise;
if (m_pIndicator)
{
//已经旋转了图片，旋转到相反的方向
m_pIndicator->RotateFlip(Gdiplus::Rotate180FlipNone);
}

}
}

void CircleProgress::SetCircleWidth(int nCircleWidth)
{
m_nCircleWidth = nCircleWidth;
Invalidate();
}

void CircleProgress::SetBackgroudColor(const std::wstring& strColor)
{
m_dwBackgroundColor = GlobalManager::GetTextColor(strColor);
ASSERT(m_dwBackgroundColor != 0);
Invalidate();
}

void CircleProgress::SetForegroudColor(const std::wstring& strColor)
{
m_dwForegroundColor = GlobalManager::GetTextColor(strColor);
ASSERT(m_dwForegroundColor != 0);
Invalidate();
}

void CircleProgress::SetIndicator(const std::wstring& sIndicatorImage)
{
if (m_sIndicatorImage != sIndicatorImage)
{
m_sIndicatorImage = sIndicatorImage;
if (m_pIndicator)
{
delete m_pIndicator;
m_pIndicator = nullptr;
}
std::wstring imagepath = m_sIndicatorImage;
if (!::PathFileExistsW(imagepath.c_str())) {
imagepath = GlobalManager::GetResourcePath() + m_pWindow->GetWindowResourcePath() + imagepath;
}
if (!::PathFileExistsW(imagepath.c_str())) {
return;
}
m_pIndicator = new Gdiplus::Image(imagepath.c_str());

Gdiplus::Status state = m_pIndicator->GetLastStatus();
if (Gdiplus::Ok == state)
{
// 假定图片指向上
m_pIndicator->RotateFlip(m_bClockwise ? Gdiplus::Rotate90FlipNone : Gdiplus::Rotate270FlipNone);
Invalidate();
}
}
}

void CircleProgress::SetCircleGradientColor(const std::wstring& strColor)
{
m_dwGradientColor = GlobalManager::GetTextColor(strColor);
ASSERT(m_dwGradientColor != 0);
Invalidate();
}
}