Question

我有一个AbsoluteFieldManager，它在水平行中包含多个Fields，切换焦点工作正常。现在我需要在与上面左侧字段相同的水平位置添加另一个Field。这样做时，我无法专注于第一个领域。屏幕应如下所示：

________________________
|  ____   ____   ____  |
| |_f1_| |_f2_| |_f3_| |
|  ____                |
| |_f4_|               | with f4 added here, f1 isn't focusable, once it has
|______________________| lost focus.

如果您有任何想法如何解决这个问题，我会感到满意。到目前为止，这是我的代码：

TestScreen：

import net.rim.device.api.system.Display;
import net.rim.device.api.ui.container.AbsoluteFieldManager;
import net.rim.device.api.ui.container.MainScreen;

public class TestScreen extends MainScreen {
    int screenY = Display.getWidth();
    int screenX = Display.getHeight();

    public TestScreen() {
        AbsoluteFieldManager manager = new AbsoluteFieldManager();
        TestField f1 = new TestField(50, 50, true);
        TestField f2 = new TestField(50, 50, true);
        TestField f3 = new TestField(50, 50, true);
        TestField f4 = new TestField(50, 50, true);
        TestField f5 = new TestField(50, 50, false);
        manager.add(f1, 0, 0);
        manager.add(f2, 60, 0);
        manager.add(f3, 120, 0);
        manager.add(f4, 180, 0);
        // this works fine: 
        // manager.add(f5, 1, 80);
        // this not:
        manager.add(f5, 0, 80);
        add(manager);
    }
}

TestField：

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;


public class TestField extends Field {
    boolean isFocusable;
    int width, height;
    int bgColorUnfocused, bgColorFocused;
    public TestField(int width, int height, boolean isFocusable){
        this.width=width;
        this.height=height;
        this.isFocusable=isFocusable;
        bgColorUnfocused= 0xC0C0C0;
        bgColorFocused = 0x3956F7;
    }
    protected void layout(int w, int h) {
        setExtent(width, height);
    }
    public boolean isFocusable() {
        return isFocusable;
    }
    protected void paint(Graphics g) {
        g.setColor(isFocus() ? bgColorFocused : bgColorUnfocused);
        g.fillRect(0, 0, width, height);        
    }

}

TestApp：

import net.rim.device.api.ui.UiApplication;


public class TestApp extends UiApplication{
    TestScreen screen = new TestScreen();
    public static void main(String args[]){
        TestApp app = new TestApp();
        app.enterEventDispatcher();
    }
    public TestApp(){
        pushScreen(screen);
    }
}

Answer 1

由于AbsoluteFieldManager并不确定您放置物品的位置，因此在使用拨轮时它不知道发送焦点的顺序。如果你想对AFM进行管理，那么你可以根据它的位置和预期的移动位置来指定获得焦点的人。

请查看http://www.blackberry.com/developers/docs/5.0.0api/net/rim/device/api/ui/Manager.html#nextFocus(int,%20int）了解更多详情。

blackberry：获取字段焦点的问题，如果另一个字段绘制到相同的x坐标

1 个答案: