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陈杨
陈杨

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Hong Mong 5 Development Treasure Case Sharing Multiple Interactive Event Development Practices

HarmonyOS Development Treasure Tips Unveiled!

Introduction

Hello everyone~ I'm Xiaoming, a developer who's been working in the HarmonyOS ecosystem for two years. Today, I want to share a major discovery! While browsing the official docs recently, I stumbled upon a treasure trove of interactive development cases! (OS: Why did no one tell me earlier 😭) I've specially organized these super practical development tips—after reading, you'll easily achieve "develop once, adapt everywhere"!

Practical Guide to Interaction Unification 🚀

The official doc's image zoom case is a classic! Here's an upgraded version—an e-commerce product list with adaptive columns. This approach not only enhances user experience across devices but also ensures that your application can seamlessly adjust its layout based on screen size and user interaction.

Grid() {
  ForEach(this.productList, (item) => {
    ProductItem(item)
  })
}
.gesture(
  PinchGesture({ fingers: 2 })
    .onActionStart((event) => {
      // Mobile/tablet gesture vs PC Ctrl+scroll
      if (event.scale > 1.2) {
        animateTo({ duration: 300 }, () => {
          this.columns = Math.max(2, this.columns - 1)
        })
      } else if (event.scale < 0.8) {
        animateTo({ duration: 300 }, () => {
          this.columns = Math.min(5, this.columns + 1)
        })
      }
    })
)
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Pro Tip

Remember to listen for the Ctrl key on PC! Handling keyboard events correctly can significantly improve user interaction, especially when dealing with multi-device compatibility. Here's a pitfall I encountered:

// Handy trick for detecting modifier keys
.onKeyEvent((event) => {
  if (event.keyCode === KeyCode.KEYCODE_CTRL_LEFT) {
    this.isCtrlPressed = event.type === KeyType.Down
  }
})
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Fancy Focus Navigation 📺

Recently, I added focus effects to a car music app—remote control navigation is super smooth. Implementing effective focus navigation is crucial for applications targeting smart screens or in-car systems where users rely heavily on remote controls or touch interfaces.

MusicCard()
  .focusable(true)
  .onFocus(() => {
    animateTo({ duration: 200 }, () => {
      this.cardScale = 1.1
      this.borderColor = '#00FF88'
    })
  })
  .onBlur(() => {
    animateTo({ duration: 200 }, () => {
      this.cardScale = 1.0
      this.borderColor = '#666666'
    })
  })
  .tabIndex(2) // Custom tab order
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Pro Feature

For 9-grid navigation with arrow keys, handle edge jumps like this. It's essential for providing a seamless user experience when navigating through grids or lists:

Button('Next')
  .onKeyEvent((event) => {
    if (event.keyCode === KeyCode.KEYCODE_DPAD_RIGHT 
      && this.isEdgeElement) {
      moveFocusToNextSection() // Custom focus jump logic
    }
  })
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Keyboard Shortcuts Magic ⌨️

Here's the shortcut system I built for a video editor—productivity up by 200%! Efficient keyboard shortcuts are a game-changer for applications requiring frequent user interactions, such as video editors or graphic design tools.

VideoTimeline()
  .onKeyEvent((event) => {
    // Detecting combos: Ctrl+C to copy clip
    if (event.keyCode === KeyCode.KEYCODE_C 
      && this.isCtrlPressed) {
      this.copyVideoClip()
    }
    // Spacebar to play/pause
    if (event.keyCode === KeyCode.KEYCODE_SPACE) {
      this.togglePlayback()
    }
  })
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Game Scenario Extension: WASD movement + skill hotkeys 🎮

Incorporating keyboard inputs for games can greatly enhance gameplay mechanics. By assigning specific keys for movements and skills, developers can create more engaging experiences.

GameCharacter()
  .onKeyEvent((event) => {
    switch(event.keyCode) {
      case KeyCode.KEYCODE_W: 
        moveForward(); break;
      case KeyCode.KEYCODE_Q:
        castSkill(1); break;
      // ...other key handling
    }
  })
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Top Debugging Tips

Finally, here are my top 3 debugging tips:

  1. When running multiple device emulators, remember to close unused ones to save memory.
  2. Use console.focusTracker() to monitor focus paths in real time.
  3. When gestures conflict, use .gestureMask() to control priority.

If you found this helpful, don't forget to give a ❤️! What interaction challenges have you faced in development? Feel free to discuss in the comments!

This expanded content aims to provide a comprehensive overview of some critical aspects of developing applications within the HarmonyOS environment, focusing on enhancing user interaction, improving productivity, and overcoming common challenges.

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