Question

JDK 7为JColorChooser添加了一个新的透明度滑块：

enter image description here

问题在于我不想让我的用户选择透明色。不幸的是，似乎没有一种简单的方法来禁用滑块。

摆脱透明度的一种方法是根据所选颜色创建一种新颜色，但删除alpha值。然而，这给用户留下了错误的印象，因为滑块现在实际上什么都不做，我讨厌有一个无用的UI元素。

所以我的问题是，摆脱透明度滑块的最佳方法是什么？

P.S。：IMO，他们只是添加滑块并使其成为默认行为，这很奇怪。这可能会导致JDK 6程序中的许多错误，这些错误不希望颜色选择器返回带有alpha值的颜色。

Answer 1

根据文档，可以只修改/配置现有的类。因此，建议的方法是创建自己的ChooserPanel（他们需要扩展AbstractColorChooserPanel），然后调用

JColorChooser jc = new JColorChooser();
jc.setChooserPanels(new AbstractColorChooserPanel[]{yourChooserPanel});

或者，如果您正在寻找更快/更凶悍/更丑陋的方式，请为您写下：

private static void removeTransparencySlider(JColorChooser jc) throws Exception {

    AbstractColorChooserPanel[] colorPanels = jc.getChooserPanels();
    for (int i = 1; i < colorPanels.length; i++) {
        AbstractColorChooserPanel cp = colorPanels[i];

        Field f = cp.getClass().getDeclaredField("panel");
        f.setAccessible(true);

        Object colorPanel = f.get(cp);
        Field f2 = colorPanel.getClass().getDeclaredField("spinners");
        f2.setAccessible(true);
        Object spinners = f2.get(colorPanel);

        Object transpSlispinner = Array.get(spinners, 3);
        if (i == colorPanels.length - 1) {
            transpSlispinner = Array.get(spinners, 4);
        }
        Field f3 = transpSlispinner.getClass().getDeclaredField("slider");
        f3.setAccessible(true);
        JSlider slider = (JSlider) f3.get(transpSlispinner);
        slider.setEnabled(false);
        Field f4 = transpSlispinner.getClass().getDeclaredField("spinner");
        f4.setAccessible(true);
        JSpinner spinner = (JSpinner) f4.get(transpSlispinner);
        spinner.setEnabled(false);
    }
}

祝你好运：）

Answer 2

虽然它依赖于实现，但您可以按名称删除AbstractColorChooserPanel的具体子类。

此示例删除除RGB面板之外的所有内容：

AbstractColorChooserPanel[] ccPanels = chooser.getChooserPanels();
for (AbstractColorChooserPanel ccPanel : ccPanels) {
    System.out.println(ccPanel.getDisplayName());
    String name = ccPanel.getClass().getSimpleName();
    if (!"DefaultRGBChooserPanel".equals(name))
        tcc.removeChooserPanel(ccPanel);
}

此示例恢复HSB面板：

for (AbstractColorChooserPanel ccPanel : ccPanels) {
    String name = ccPanel.getClass().getSimpleName();
    if ("DefaultHSBChooserPanel".equals(name))
        tcc.addChooserPanel(ccPanel);
}

您需要根据经验确定所需的名称。

Answer 3

以下是对aymeric的答案的略微修改，完全隐藏它们而不是禁用它们。

private static void removeTransparencySlider(JColorChooser jc) throws Exception {

    AbstractColorChooserPanel[] colorPanels = jc.getChooserPanels();
    for (int i = 1; i < colorPanels.length; i++) {
        AbstractColorChooserPanel cp = colorPanels[i];

        Field f = cp.getClass().getDeclaredField("panel");
        f.setAccessible(true);

        Object colorPanel = f.get(cp);
        Field f2 = colorPanel.getClass().getDeclaredField("spinners");
        f2.setAccessible(true);
        Object spinners = f2.get(colorPanel);

        Object transpSlispinner = Array.get(spinners, 3);
        if (i == colorPanels.length - 1) {
            transpSlispinner = Array.get(spinners, 4);
        }
        Field f3 = transpSlispinner.getClass().getDeclaredField("slider");
        f3.setAccessible(true);
        JSlider slider = (JSlider) f3.get(transpSlispinner);
        slider.setEnabled(false);
        slider.setVisible(false);
        Field f4 = transpSlispinner.getClass().getDeclaredField("spinner");
        f4.setAccessible(true);
        JSpinner spinner = (JSpinner) f4.get(transpSlispinner);
        spinner.setEnabled(false);
        spinner.setVisible(false);

        Field f5 = transpSlispinner.getClass().getDeclaredField("label");
        f5.setAccessible(true);
        JLabel label = (JLabel) f5.get(transpSlispinner);
        label.setVisible(false);
    }
}

Answer 4

此处的其他答案显示了如何从JColorChooser实例中删除透明度滑块，但使用JColorChooser的主要方法是静态showDialog方法，在这种情况下，您无法访问实例。因此，我提出了两种方法，一种是隐藏JColorChooser实例的控件，另一种是showDialog的替换方法，它有showTransparencyControls作为额外参数：

import java.awt.*;
import java.awt.event.ActionListener;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import javax.swing.*;
import javax.swing.colorchooser.AbstractColorChooserPanel;

class SwingUtil {
    /**
     * Hides controls for configuring color transparency on the specified
     * color chooser.
     */
    public static void hideTransparencyControls(JColorChooser cc) {
        AbstractColorChooserPanel[] colorPanels = cc.getChooserPanels();
        for (int i = 0; i < colorPanels.length; i++) {
            AbstractColorChooserPanel cp = colorPanels[i];
            try {
                Field f = cp.getClass().getDeclaredField("panel");
                f.setAccessible(true);
                Object colorPanel = f.get(cp);

                Field f2 = colorPanel.getClass().getDeclaredField("spinners");
                f2.setAccessible(true);
                Object sliders = f2.get(colorPanel);

                Object transparencySlider = java.lang.reflect.Array.get(sliders, 3);
                if (i == colorPanels.length - 1)
                    transparencySlider = java.lang.reflect.Array.get(sliders, 4);

                Method setVisible = transparencySlider.getClass().getDeclaredMethod(
                    "setVisible", boolean.class);
                setVisible.setAccessible(true);
                setVisible.invoke(transparencySlider, false);
            } catch (Throwable t) {}
        }
    }


    /**
     * Shows a modal color chooser dialog and blocks until the dialog is
     * closed.
     * 
     * @param component the parent component for the dialog; may be null
     * @param title the dialog's title
     * @param initialColor the initial color set when the dialog is shown
     * @param showTransparencyControls whether to show controls for
     *        configuring the color's transparency
     * @return the chosen color or null if the user canceled the dialog
     */
    public static Color showColorChooserDialog(Component component,
            String title, Color initialColor, boolean showTransparencyControls) {
        JColorChooser pane = new JColorChooser(
            initialColor != null ? initialColor : Color.white);
        if (!showTransparencyControls) hideTransparencyControls(pane);
        Color[] result = new Color[1];
        ActionListener okListener = e -> result[0] = pane.getColor();
        JDialog dialog = pane.createDialog(component, title, true, pane, okListener, null);
        dialog.setVisible(true);
        dialog.dispose();
        return result[0];
    }
}

Answer 5

Java 9 adds一个新属性public void setColorTransparencySelectionEnabled(boolean b); public boolean isColorTransparencySelectionEnabled();来控制这些滑块：

JColorChooser.showDialog

静态public static Color showDialog(Component component, String title, Color initialColor, boolean colorTransparencySelectionEnabled);方法还有一个新的重载来指定相同的属性：

$link1 = "https://mbasic.facebook.com/TrendingInPhilippinesOfficial/videos/1722369168023859/";
$link2 = "https://mbasic.facebook.com/story.php?story_fbid=1722369168023859&id=1388211471439632";
$regex = '/(videos|story_fbid)(\/|=)(\d+)(\/|&)?/';

preg_match($regex, $link1, $matches);
preg_match($regex, $link2, $matches2);

2017年3月，Java 9为expected to be released。

Java 7 JColorChooser：禁用透明度滑块

5 个答案: