TouchGFX之自定义控件

在创建应用时，您可能需要TouchGFX中没有包含的控件。在创建应用时，您可能需要TouchGFX中没有包含的控件。但有时此法并不够用，当您需要全面控制帧缓冲时，您需要使用自定义控件法。

TouchGFX Designer目前不支持自定义控件的创建。 因此，您将需要手动写入自定义控件的代码，然后在视图的用户代码部分插入控件。

示例为自定义一个二维码控件

#ifndef QR_CODE_HPP
#define QR_CODE_HPP
#include <touchgfx/hal/Types.hpp>class QRCode
{
public:/* 获取该坐标值 */bool at(uint16_t x, uint16_t y) const;/* 获取宽度 */uint16_t getWidth() const;/* 获取高度 */uint16_t getHeight() const;
};#endif

#include <gui/model/QRCode.hpp>
#include <stdlib.h>bool QRCode::at(uint16_t x, uint16_t y) const
{srand(x*123456+y*getWidth()*23456789);for(int i = 0; i < 100; i++){srand(rand());}return ((rand() / (float)RAND_MAX) > 0.5f);
}uint16_t QRCode::getWidth() const
{return 16;
}uint16_t QRCode::getHeight() const
{return 16;
}

#ifndef QR_CODE_WIDGET_HPP
#define QR_CODE_WIDGET_HPP
#include <touchgfx/widgets/Widget.hpp>
#include <gui/model/QRCode.hpp>
#include <touchgfx/hal/Types.hpp>class QRCodeWidget : public touchgfx::Widget
{
public:QRCodeWidget();/* 绘制 */virtual void draw(const touchgfx::Rect& invalidatedArea) const;/* 获取实心区域 */virtual touchgfx::Rect getSolidRect() const;/* 设置二维码成员变量 */void setQRCode(QRCode *code);/* 设置缩放比例成员变量 */void setScale(uint8_t s);private:/* 更新二维码控件尺寸 */void updateSize();QRCode *code;uint8_t scale;
};#endif

#include <gui/common/QRCodeWidget.hpp>
#include <touchgfx/hal/HAL.hpp>QRCodeWidget::QRCodeWidget() : code(0),scale(1)
{
}void QRCodeWidget::setQRCode(QRCode *qrCode)
{code = qrCode;updateSize();
}void QRCodeWidget::draw(const touchgfx::Rect& invalidatedArea) const
{if(!code){return;}touchgfx::Rect absolute = getAbsoluteRect();uint16_t *framebuffer = touchgfx::HAL::getInstance()->lockFrameBuffer();for(int y = invalidatedArea.y; y < invalidatedArea.bottom(); y++){for(int x = invalidatedArea.x; x < invalidatedArea.right(); x++){framebuffer[absolute.x + x + (absolute.y + y) * touchgfx::HAL::DISPLAY_WIDTH] = code->at(x / scale, y / scale) ? 0x0000 : 0xffff;}}touchgfx::HAL::getInstance()->unlockFrameBuffer();
}touchgfx::Rect QRCodeWidget::getSolidRect() const
{return touchgfx::Rect(0,0,getWidth(), getHeight());
}void QRCodeWidget::setScale(uint8_t s)
{scale = s;updateSize();
}void QRCodeWidget::updateSize()
{if(code){setWidth(code->getWidth() * scale);setHeight(code->getHeight() * scale);}    
}

#include <gui/screen_screen/screenView.hpp>screenView::screenView()
{}void screenView::setupScreen()
{screenViewBase::setupScreen();myQRCodeWidget.setScale(10);myQRCodeWidget.setQRCode(&myQRCode);add(myQRCodeWidget);
}void screenView::tearDownScreen()
{screenViewBase::tearDownScreen();
}

运行模拟器：显示效果如下