[问答]

如何访问flexbutton小部件的所有3个回调？

问答对人有帮助，内容完整，我也想知道答案 0 我的代码需要对按下按钮、按下按钮和释放按钮做出反应。但是在 touchgfx 设计器中只能选择这些回调之一...... 0
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答案对人有帮助，有参考价值 0 实际上，您通常无法使用 Designer 访问一个按钮的 3 个回调。为此，您需要自己实施。当按钮只有 2 个状态时，我真的不明白 3 个回调的意义：按下和释放。按下和按下按钮不应该是一样的吗？我尝试了一个按钮的粗略实现，该按钮在当前状态（按下或释放）的屏幕视图中触发回调。为此，我基于 Flex 按钮的 Designer 实现，基于 ImageButtonStyle.hpp、ClickButtonTrigger.hpp 和 AbstractContainer.hpp 的组合创建了我自己的小部件。这是小部件的代码以及屏幕视图自定义按钮容器.hpp #ifndef CUSTOMBUTTONCONTAINER_HPP #define CUSTOMBUTTONCONTAINER_HPP #include #include namespace touchgfx { /** * @class CustomButtonTrigger CustomButtonTrigger.hpp / class CustomButtonContainer : public Container { public: /* * @fn CustomButtonContainer::CustomButtonContainer() * * @brief Default constructor. / CustomButtonContainer() : pressed(false), alpha(255), up(), down(), action(0) { setTouchable(true); buttonImage.setXY(0, 0); add(buttonImage); } /* * @fn virtual CustomButtonContainer::~CustomButtonContainer() * * @brief Destructor. / virtual ~CustomButtonContainer() {} /* * @fn virtual void CustomButtonContainer::setBitmaps(const Bitmap& bmpReleased, const Bitmap& bmpPressed) * * @brief Sets the bitmaps. * * @param bmpReleased The bitmap released. * @param bmpPressed The bitmap pressed. / virtual void setBitmaps(const Bitmap& bmpReleased, const Bitmap& bmpPressed) { up = bmpReleased; down = bmpPressed; setWidth(down.getWidth()); setHeight(down.getHeight()); handlePressedUpdated(); } /* * @fn void CustomButtonContainer::setBitmapXY(uint16_t x, uint16_t y) * * @brief Sets bitmap xy. * * @param x An uint16_t to process. * @param y An uint16_t to process. / void setBitmapXY(uint16_t x, uint16_t y) { buttonImage.setXY(x, y); } /* * @fn Bitmap CustomButtonContainer::getCurrentlyDisplayedBitmap() const * * @brief Gets currently displayed bitmap. * * @return The currently displayed bitmap. / Bitmap getCurrentlyDisplayedBitmap() const { return (pressed ? down : up); } /* * @fn void CustomButtonContainer::setPressed(bool isPressed) * * @brief Sets the pressed state. * * @param isPressed True if is pressed, false if not. / void setPressed(bool isPressed) { pressed = isPressed; handlePressedUpdated(); } /* * @fn bool CustomButtonContainer::getPressed() * * @brief Gets the pressed state. * * @return True if it succeeds, false if it fails. / bool getPressed() { return pressed; } /* * @fn void CustomButtonContainer::setAlpha(uint8_t newAlpha) * * @brief Sets an alpha value. * * @param newAlpha The new alpha. / void setAlpha(uint8_t newAlpha) { alpha = newAlpha; handleAlphaUpdated(); } /* * @fn uint8_t CustomButtonContainer::getAlpha() const * * @brief Gets the alpha. * * @return The alpha value. / uint8_t getAlpha() const { return alpha; } /* * @fn void CustomButtonContainer::setAction(GenericCallback< const CustomButtonContainer&, bool& >& callback) * * @brief Sets an action callback. * * @param callback The callback. / void setAction(GenericCallback< const CustomButtonContainer&, bool& >& callback) { action = &callback; } /* * @fn virtual void CustomButtonContainer::handleClickEvent(const ClickEvent& event) * * @brief Handles the click event described by event. * * @param event The event. / virtual void handleClickEvent(const ClickEvent& event) { bool wasPressed = getPressed(); bool newPressedValue = (event.getType() == ClickEvent::PRESSED); if ((newPressedValue && !wasPressed) \|\| (!newPressedValue && wasPressed)) { setPressed(newPressedValue); invalidate(); if (action->isValid()) { action->execute(this, pressed); } } } protected: bool pressed; ///< True if pressed uint8_t alpha; ///< The current alpha value. 255 denotes solid, 0 denotes completely transparent. Image buttonImage; ///< The button image Bitmap up; ///< The image to display when button is released. Bitmap down; ///< The image to display when button is pressed. GenericCallback< const CustomButtonContainer&, bool&>* action; ///< The action /** * @fn virtual void CustomButtonContainer::handlePressedUpdated() * * @brief Handles the pressed updated. / virtual void handlePressedUpdated() { buttonImage.setBitmap(pressed ? down : up); } /* * @fn virtual void CustomButtonContainer::handleAlphaUpdated() * * @brief Handles the alpha updated. */ virtual void handleAlphaUpdated() { buttonImage.setAlpha(alpha); } }; } // namespace touchgfx #endif // CUSTOMBUTTONCONTAINER_HPP Screen1View.hpp #ifndef SCREEN1VIEW_HPP #define SCREEN1VIEW_HPP #include #include #include class Screen1View : public Screen1ViewBase { public: Screen1View(); virtual ~Screen1View() {} virtual void setupScreen(); virtual void tearDownScreen(); protected: touchgfx::CustomButtonContainer customButton; Callback buttonEventCallback; void handleButtonEvent(const CustomButtonContainer& element, bool& buttonState); }; #endif // SCREEN1VIEW_HPP Screen1View.cpp #include #include "BitmapDatabase.hpp" Screen1View::Screen1View(): buttonEventCallback(this, &Screen1View::handleButtonEvent) { customButton.setBitmaps(Bitmap(BITMAP_BLUE_BUTTONS_ROUND_EDGE_MEDIUM_ID), Bitmap(BITMAP_BLUE_BUTTONS_ROUND_EDGE_MEDIUM_PRESSED_ID)); customButton.setBitmapXY(0, 0); customButton.setPosition(285, 200, 230, 60); add(customButton); customButton.setAction(buttonEventCallback); } void Screen1View::setupScreen() { Screen1ViewBase::setupScreen(); } void Screen1View::tearDownScreen() { Screen1ViewBase::tearDownScreen(); } void Screen1View::handleButtonEvent(const CustomButtonContainer& element, bool& buttonState) { if(buttonState) { touchgfx_printf("pressedn"); } else { touchgfx_printf("releasedn"); } } 您可以先尝试使用此代码，但要确保设计人员知道您为按钮使用的位图。需要说明的是，这只是一个粗略的例子，而不是官方的解决方案

2022-12-26 15:23:07 评论举报陈福蓓