BasicTabbedPaneUI聚焦時顯示邊框

Question

我正在嘗試通過擴展BasicTabbedPaneUI來制作自定義TabbedPaneUI

我在設置TextColor時遇到問題，每當設置TextColor時，當窗格被聚焦並啟用時，它都會顯示邊框。

如您所見，具有標題“ Test已啟用/已選擇窗格”的窗格，其周圍有白色邊框，我不希望使用該邊框。 我已經覆蓋了paintTabBorder

@Override
protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {
    //We do nothing here to disable painting the Tab Border
}

這是我重寫paintText以更改文本顏色的方法

@Override
protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) {

    g.setFont(font);

    View v = getTextViewForTab(tabIndex);
    if (v != null) {
        // html
        v.paint(g, textRect);
    } else {
        // plain text
        int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);

        if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {

            //Change the text to White here <- Causing Border Issues
            g.setColor(Color.WHITE);

            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x, textRect.y + metrics.getAscent());

        } else { // tab disabled
            g.setColor(tabPane.getBackgroundAt(tabIndex).brighter());
            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x, textRect.y + metrics.getAscent());
            g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x - 1, textRect.y + metrics.getAscent() - 1);

        }
    }
}

g.setColor(Color.WHITE); 是造成邊框問題的原因，我通過將“顏色”設置為其他顏色而不是“白色”來確認了這一點，並且邊框和文本一樣都是該顏色。

Answer 1

只需用背景顏色繪制另一個空標題即可有效隱藏邊框。

@Override
protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) {

    g.setFont(font);

    View v = getTextViewForTab(tabIndex);
    if (v != null) {
        // html
        v.paint(g, textRect);
    } else {
        // plain text
        int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);

        if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {

            //Change the text to White here
            g.setColor(Color.WHITE);

            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x, textRect.y + metrics.getAscent());

            //Remove Border Issues
            g.setColor(tabPane.getBackgroundAt(tabIndex).darker());

            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    "", mnemIndex,                                 //<-- empty title here
                    textRect.x, textRect.y + metrics.getAscent());

        } else { // tab disabled
            g.setColor(tabPane.getBackgroundAt(tabIndex).brighter());
            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x, textRect.y + metrics.getAscent());
            g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x - 1, textRect.y + metrics.getAscent() - 1);

        }
    }
}

Answer 2

經過一些研究，我想出了解決邊框問題的方法，在繪制String后必須設置圖形顏色。 g.setColor(selectColor);

            //Change the text to White here <- Causing Border Issues
            g.setColor(Color.WHITE);

            SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
                    title, mnemIndex,
                    textRect.x, textRect.y + metrics.getAscent());

            //reset the color to selectedColor
            g.setColor(selectColor);