我在VerticalFieldManager中有一个ImageButton,在HorizontalFieldManager中有一个VFM。单击周围字段中的任意位置时,将触发ImageButton单击事件。我希望点击事件仅在单击ImageButton而不是字段(VFM或HFM)时触发。
以下是代码:
ImageButton Login = new ImageButton(configModel.getLoginButton(), FOCUSABLE|Field.FIELD_RIGHT, "login.png", "plogin.png",0x9cbe95);
HorizontalFieldManager hfm = new HorizontalFieldManager(USE_ALL_WIDTH);
VerticalFieldManager loginButtonVfm = new VerticalFieldManager(USE_ALL_WIDTH);
loginButtonVfm.add(Login);
hfm.add(loginButtonVfm);
add(hfm);
FieldChangeListener loginListener = new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
Dialog.alert("Fired");
}
}
Login.setChangeListener(loginListener);
ImageButton类代码在这里:
public class ImageButton extends Field{
//Image Button Class
private String _label;
private int _labelHeight;
private int _labelWidth;
private Font _font;
private Bitmap _currentPicture;
private Bitmap _onPicture;
private Bitmap _offPicture;
int color;
public ImageButton(String text, long style ,String img, String img_hvr, int color){
super(style);
_offPicture = Bitmap.getBitmapResource(img);
_onPicture = Bitmap.getBitmapResource(img_hvr);
_font = Font.getDefault().derive(Font.BOLD, 7, Ui.UNITS_pt);
_label = text;
_labelHeight = _onPicture.getHeight();
_labelWidth = _onPicture.getWidth();
this.color = color;
_currentPicture = _offPicture;
}
public void setImage(String img){
_offPicture = Bitmap.getBitmapResource(img);
_currentPicture = _offPicture;
}
/**
* @return The text on the button
*/
public void setText(String text){
_label = text;
}
String getText(){
return _label;
}
/**
* Field implementation.
* @see net.rim.device.api.ui.Field#getPreferredHeight()
*/
public int getPreferredHeight(){
return _labelHeight;
}
/**
* Field implementation.
* @see net.rim.device.api.ui.Field#getPreferredWidth()
*/
public int getPreferredWidth(){
return _labelWidth;
}
/**
* Field implementation. Changes the picture when focus is gained.
* @see net.rim.device.api.ui.Field#onFocus(int)
*/
protected void onFocus(int direction) {
_currentPicture = _onPicture;
// invalidate();
super.onFocus(direction);
}
/**
* Field implementation. Changes picture back when focus is lost.
* @see net.rim.device.api.ui.Field#onUnfocus()
*/
protected void onUnfocus() {
_currentPicture = _offPicture;
invalidate();
super.onUnfocus();
}
/**
* Field implementation.
* @see net.rim.device.api.ui.Field#drawFocus(Graphics, boolean)
*/
// protected void drawFocus(Graphics graphics, boolean on) {
// // Do nothing
// }
protected void drawFocus(Graphics graphics, boolean on) {
if (on) {
//draw your own custom focus.
}
}
/**
* Field implementation.
* @see net.rim.device.api.ui.Field#layout(int, int)
*/
protected void layout(int width, int height) {
setExtent(Math.min( width, getPreferredWidth()),
Math.min( height, getPreferredHeight()));
}
/**
* Field implementation.
* @see net.rim.device.api.ui.Field#paint(Graphics)
*/
protected void paint(Graphics graphics){
// First draw the background colour and picture
graphics.setColor(this.color);
graphics.fillRect(0, 0, getWidth(), getHeight());
graphics.drawBitmap(0, 0, getWidth(), getHeight(), _currentPicture, 0, 0);
// Then draw the text
graphics.setColor(Color.WHITE);
graphics.setFont(_font);
graphics.setFont(graphics.getFont().derive(Font.BOLD));
graphics.drawText(_label, 5,9,
(int)( getStyle() & DrawStyle.ELLIPSIS | DrawStyle.VALIGN_MASK | DrawStyle.HALIGN_MASK),
getWidth() - 6 );
}
/**
* Overridden so that the Event Dispatch thread can catch this event
* instead of having it be caught here..
* @see net.rim.device.api.ui.Field#navigationClick(int, int)
*/
protected boolean navigationClick(int status, int time){
fieldChangeNotify(1);
return true;
}
}
答案 0 :(得分:1)
当您尝试自己编写自定义字段时,这种事情实际上很容易找到错误。 (这不是你的错......黑莓Java使这些东西比实际应该更难!)
我认为解决此问题的最简单方法是重用其他人已经测试过的内容。我建议查看BlackBerry Advanced UI库,特别是这两个类:
我认为他们完全符合你的需要。我相信您需要更改或添加到ImageButton
课程的重要代码是:
protected boolean keyChar( char character, int status, int time )
{
if( character == Characters.ENTER ) {
clickButton();
return true;
}
return super.keyChar( character, status, time );
}
protected boolean navigationClick( int status, int time )
{
if (status != 0) clickButton();
return true;
}
protected boolean trackwheelClick( int status, int time )
{
if (status != 0) clickButton();
return true;
}
protected boolean invokeAction( int action )
{
switch( action ) {
case ACTION_INVOKE: {
clickButton();
return true;
}
}
return super.invokeAction( action );
}
protected boolean touchEvent( TouchEvent message )
{
int x = message.getX( 1 );
int y = message.getY( 1 );
if( x < 0 || y < 0 || x > getExtent().width || y > getExtent().height ) {
// Outside the field
return false;
}
switch( message.getEvent() ) {
case TouchEvent.UNCLICK:
clickButton();
return true;
}
return super.touchEvent( message );
}
/**
* A public way to click this button
*/
public void clickButton()
{
fieldChangeNotify( 0 );
}
然后,您就可以像现在一样使用FieldChangeListener
,但除非点按按钮,否则图片按钮不会调用它。
如果需要,您当然可以更改上面的代码以使用
fieldChangeNotify( 1 );
如果1
是您有意义的上下文值。重要的是添加其他方法,并更改navigationClick()
。