在黑莓单击事件过程中改变ButtonField字段背景

问题描述

在黑莓，如何更改在单击事件期间的 ButtonField字段的背景颜色？例如，对于长preSS的背景颜色需要改变。对我来说，它采取默认的颜色为蓝色。如何改变呢？

In BlackBerry, how to change the ButtonField background color during the click event? For example, for the long press the background color needs to change. For me it takes the default color blue. How to change it?

这是我们的自定义按钮移到现场。但它显示了默认的蓝色的按钮单击事件。

This is our custom buttton field. But it shows the default blue color for the button click event.

public class CustomButtonField extends ButtonField implements GlobalConstant {
int mHeight;
int mWidth;
public final static int DEFAULT_BACKGROUND_COLOR_NORMAL = 0x167c9c;
public final static int DEFAULT_BACKGROUND_COLOR_ON_FOCUS = 0x188118;
private int backgroundColorNormal = DEFAULT_BACKGROUND_COLOR_NORMAL;
private int backgroundColorOnFocus = DEFAULT_BACKGROUND_COLOR_ON_FOCUS;
private Background noraml_bg;
private Background focus_bg;
private boolean isFocusable;
private boolean isround_button = false;


public CustomButtonField(int height, int width, String label) {
    super(label, CONSUME_CLICK);

    noraml_bg = menuButton_bgNormal;
    focus_bg = menuButton_bgFocus;

    mHeight = height;
    mWidth = width;
    this.isFocusable = true;
    setBorder(BorderFactory.createSimpleBorder(new XYEdges(0, 0, 0, 0)));
    setBorder(VISUAL_STATE_ACTIVE,
            BorderFactory.createSimpleBorder(new XYEdges(0, 0, 0, 0)));

}

public CustomButtonField(int height, int width, String label, boolean isround_button) {
    super(label, CONSUME_CLICK);

    this.isround_button = isround_button;
    noraml_bg = roundButton_bgNormal;
    focus_bg = roundButton_bgFocus;
    mHeight = height;
    mWidth = width;
    this.isFocusable = true;

    XYEdges padding = new XYEdges(1,1,1,1);
    XYEdges color = new XYEdges (Color.BLACK,Color.BLACK,Color.BLACK,Color.BLACK);
    int lineStyle = Border.STYLE_SOLID;

   Border roundedBorder = BorderFactory.createSimpleBorder(padding, color, lineStyle);
    setBorder(roundedBorder);

}

/*
 * (non-Javadoc)
 *
 * @see net.rim.device.api.ui.component.ButtonField#getPreferredHeight()
 */
public int getPreferredHeight() {
    return mHeight;
}

/*
 * (non-Javadoc)
 *
 * @see net.rim.device.api.ui.component.ButtonField#getPreferredWidth()
 */
public int getPreferredWidth() {
    return mWidth;
}

/*
 * (non-Javadoc)
 *
 * @see net.rim.device.api.ui.component.ButtonField#layout(int, int)
 */
protected void layout(int width, int height) {
    super.layout(mWidth, mHeight);
    setExtent(mWidth, mHeight);
}

/*
 * (non-Javadoc)
 *
 * @see
 * net.rim.device.api.ui.component.ButtonField#paint(net.rim.device.api.
 * ui.Graphics)
 */
protected void paint(Graphics graphics) {

    String label = getLabel();
    int x = (getPreferredWidth() - getFont().getAdvance(label)) >> 1;
    int y = (getPreferredHeight() - getFont().getHeight()) >> 1;
    if (isFocus() == false) {
        this.setBackground(noraml_bg);
        if(isround_button){
            graphics.setColor(0x666666);
        }else{
            graphics.setColor(Color.WHITE);
        }

        graphics.drawText(label, x, y);
    } else {
        this.setBackground(focus_bg);
        graphics.setColor(Color.WHITE);

        graphics.drawText(label, x, y);
    }
}

protected void drawFocus(Graphics graphics, boolean on) {
    if (on) {
        graphics.setColor(backgroundColorOnFocus);
    } else {
        graphics.setColor(backgroundColorNormal);
    }
}

public boolean isFocusable() {
    return isFocusable;
}

}

推荐答案

使用可视状态指示器的<$c$c>Field,和<$c$c>BackgroundFactory您可以设置<$c$c>Background对以下可视状态：

Using visual states indicator of the Field, and BackgroundFactory you can set Background for following visual states:

• VISUAL_STATE_ACTIVE - 活动可视状态。用户与场的相互作用。的


• VISUAL_STATE_DISABLED - 禁用视觉状态。没有与该领域没有可能的相互作用。的


• VISUAL_STATE_DISABLED_FOCUS - 禁用，但集中可视状态。外地被突出显示，但存在与场没有其他可能的相互作用。的


• VISUAL_STATE_FOCUS - 焦点可视状态。现场有焦点（高亮显示）。的


• VISUAL_STATE_NORMAL - 正常的视觉状态。没有与该领域目前没有互动。的

• VISUAL_STATE_ACTIVE - Active visual state. The user is interacting with the field.
• VISUAL_STATE_DISABLED - Disabled visual state. There is no possible interaction with the field.
• VISUAL_STATE_DISABLED_FOCUS - Disabled, but focused visual state. The field is highlighted, but there is no other possible interaction with the field.
• VISUAL_STATE_FOCUS - Focus visual state. The field has focus (is highlighted).
• VISUAL_STATE_NORMAL - Normal visual state. There is no current interaction with the field.

结果
检查以下code片断：

Check following code snippet:

ButtonField bfTest = new ButtonField("Button Field");

Background commonBgOne = BackgroundFactory.createSolidBackground(Color.RED);
Background commonBgTwo = BackgroundFactory.createSolidBackground(Color.GREEN);

bfTest.setBackground(VISUAL_STATE_ACTIVE, commonBgOne);
bfTest.setBackground(VISUAL_STATE_DISABLED, commonBgTwo);
bfTest.setBackground(VISUAL_STATE_DISABLED_FOCUS, commonBgTwo);
bfTest.setBackground(VISUAL_STATE_FOCUS, commonBgOne);
bfTest.setBackground(VISUAL_STATE_NORMAL, commonBgTwo);

结果
的取消默认的边框的

Cancelling default border

Border commonBorder = BorderFactory.createSimpleBorder(new XYEdges());

bfTest.setBorder(VISUAL_STATE_ACTIVE, commonBorder);
bfTest.setBorder(VISUAL_STATE_DISABLED, commonBorder);
bfTest.setBorder(VISUAL_STATE_DISABLED_FOCUS, commonBorder);
bfTest.setBorder(VISUAL_STATE_FOCUS, commonBorder);
bfTest.setBorder(VISUAL_STATE_NORMAL, commonBorder);

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