我在我的libgdx应用程序中设置了一个包含三个TextField的舞台,我在桌面模式和Android模式下获得了不同的行为.在Android上,键入enter键会将光标移动到下一个TextField.在桌面上,键入enter键不会执行任何操作.
如何在两个平台上使光标一致移动?我希望能够在用户输入时将焦点设置到另一个字段.在Android上,无论我将焦点设置为什么,默认输入键行为然后将焦点跳转到该字段.
这是我目前用于移动光标并清除下一个字段的代码:
stage.addListener(new InputListener() {
@Override
public boolean keyUp(InputEvent event,int keycode) {
if (keycode == Input.Keys.ENTER) {
nextField();
}
return false;
}
});
Gdx.input.setInputProcessor(stage);
}
private void nextField() {
TextField nextField =
stage.getKeyboardFocus() == text1
? text2
: stage.getKeyboardFocus() == text2
? text3
: text1;
nextField.setText("");
stage.setKeyboardFocus(nextField);
}
最佳答案
TextField使用私有内部InputListener,它在构造函数中初始化,不能轻易覆盖.更改焦点的相关代码是在此侦听器的keyTyped方法期间:
public boolean keyTyped (InputEvent event,char character) {
[...]
if ((character == TAB || character == ENTER_ANDROID) && focusTraversal)
next(Gdx.input.isKeyPressed(Keys.SHIFT_LEFT) || Gdx.input.isKeyPressed(Keys.SHIFT_RIGHT));
[...]
}
一个简单的解决方案是一起禁用焦点遍历并设置com.badlogic.gdx.scenes.scene2d.ui.TextFieldListener,它自动执行遍历:
TextField textField
textField.setFocusTraversal(false);
textField.setTextFieldListener(new TextFieldListener() {
@Override
public void keyTyped(TextField textField,char key) {
if ((key == '\r' || key == '\n')){
textField.next(Gdx.input.isKeyPressed(Keys.SHIFT_LEFT) || Gdx.input.isKeyPressed(Keys.SHIFT_RIGHT));
}
}
});
如果你需要能够使用TextFields setFocusTraversal方法启用和禁用焦点遍历,那么在将内部InputListener添加到TextField时将内部InputListener包装在自己的侦听器中也会有一个非常糟糕的解决方案(但我不建议这样做):
class MyTextField extends TextField{
class InputWrapper extends InputListener{
private final InputListener l;
public InputWrapper(InputListener l) {
super();
this.l = l;
}
@Override
public boolean handle(Event e) {
return l.handle(e);
}
@Override
public boolean touchDown(InputEvent event,float x,float y,int pointer,int button) {
return l.touchDown(event,x,y,pointer,button);
}
@Override
public void touchUp(InputEvent event,int button) {
l.touchUp(event,button);
}
@Override
public void touchDragged(InputEvent event,int pointer) {
l.touchDragged(event,pointer);
}
@Override
public boolean mouseMoved(InputEvent event,float y) {
return l.mouseMoved(event,y);
}
@Override
public void enter(InputEvent event,Actor fromActor) {
l.enter(event,fromActor);
}
@Override
public void exit(InputEvent event,Actor toActor) {
l.exit(event,toActor);
}
@Override
public boolean scrolled(InputEvent event,int amount) {
return l.scrolled(event,amount);
}
@Override
public boolean keyDown(InputEvent event,int keycode) {
return l.keyDown(event,keycode);
}
@Override
public boolean keyUp(InputEvent event,int keycode) {
return l.keyUp(event,keycode);
}
@Override
public boolean keyTyped(InputEvent event,char character) {
if (isDisabled()) {
return false;
} else if ((character == '\r' || character == '\n')){
next(Gdx.input.isKeyPressed(Keys.SHIFT_LEFT) || Gdx.input.isKeyPressed(Keys.SHIFT_RIGHT));
return true;
}
return l.keyTyped(event,character);
}
}
public MyTextField(String text,Skin skin,String styleName) {
super(text,skin,styleName);
}
public MyTextField(String text,Skin skin) {
super(text,skin);
}
public MyTextField(String text,TextFieldStyle style) {
super(text,style);
}
boolean initialized = false;
@Override
public boolean addListener (EventListener l) {
if (!initialized) {
if (!(l instanceof InputListener)) {
throw new IllegalStateException();
}
initialized = true;
return super.addListener(new InputWrapper((InputListener) l));
}
return super.addListener(l);
}
}
编辑:
再想一想,您也可以通过简单地覆盖TextField的setFocusTraversal并在调用此方法期间启用/禁用您自己的侦听器来完成第一个解决方案.