this repo has no description
render a checkboard for transparent assets
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src/main/java/app/pane/AssetsPanel.java
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src/main/java/app/pane/AssetsPanel.java
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.Image;
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import java.awt.Rectangle;
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import java.awt.RenderingHints;
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import java.awt.TexturePaint;
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import java.awt.image.BufferedImage;
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import java.awt.event.MouseAdapter;
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import java.awt.event.MouseEvent;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.FileSystems;
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import java.nio.file.Path;
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import java.nio.file.StandardWatchEventKinds;
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import java.nio.file.WatchEvent;
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import java.nio.file.WatchKey;
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private JPanel createSubdirItem(String name)
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{
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JPanel panel = createItem(name, ThemedIcon.FOLDER_OPEN_24, () -> {
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JPanel panel = createItem(name, ThemedIcon.FOLDER_OPEN_24, null, () -> {
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navigateTo(currentPath + name + "/");
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});
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return panel;
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private JPanel createAssetItem(AssetHandle asset)
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{
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JPanel panel = createItem(asset.getAssetName(), ThemedIcon.PACKAGE_24, () -> {
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JPanel panel = createItem(asset.getAssetName(), ThemedIcon.PACKAGE_24, asset, () -> {
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openAsset(asset);
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});
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···
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return panel;
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}
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private JPanel createItem(String name, Icon defaultIcon, Runnable onDoubleClick)
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private JPanel createItem(String name, Icon defaultIcon, AssetHandle asset, Runnable onDoubleClick)
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{
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JPanel panel = createItemPanel();
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JLabel icon = new JLabel(defaultIcon);
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boolean checkerboard = asset != null && asset.thumbnailHasCheckerboard();
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JLabel icon = checkerboard ? new JLabel(defaultIcon) {
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@Override
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protected void paintComponent(Graphics g)
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{
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if (getIcon() != null)
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paintCheckerboard((Graphics2D) g, this);
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super.paintComponent(g);
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}
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} : new JLabel(defaultIcon);
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icon.setHorizontalAlignment(JLabel.CENTER);
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icon.setVerticalAlignment(JLabel.CENTER);
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···
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panel.setPreferredSize(new Dimension(ITEM_SIZE, ITEM_SIZE));
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panel.setOpaque(false);
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return panel;
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}
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private static void paintCheckerboard(Graphics2D g2, JLabel label)
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{
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Icon icon = label.getIcon();
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int iconW = icon.getIconWidth();
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int iconH = icon.getIconHeight();
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int x = (label.getWidth() - iconW) / 2;
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int y = (label.getHeight() - iconH) / 2;
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Color panelBg = UIManager.getColor("Panel.background");
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boolean dark = panelBg != null && luminance(panelBg) < 0.5f;
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Color c1 = dark ? new Color(0x3C3C3C) : new Color(0xCCCCCC);
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Color c2 = dark ? new Color(0x2C2C2C) : new Color(0xFFFFFF);
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int cs = 4;
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var tile = new BufferedImage(cs * 2, cs * 2, BufferedImage.TYPE_INT_RGB);
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Graphics2D tg = tile.createGraphics();
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tg.setColor(c1);
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tg.fillRect(0, 0, cs, cs);
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tg.fillRect(cs, cs, cs, cs);
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tg.setColor(c2);
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tg.fillRect(cs, 0, cs, cs);
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tg.fillRect(0, cs, cs, cs);
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tg.dispose();
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g2.setPaint(new TexturePaint(tile, new Rectangle(x, y, cs * 2, cs * 2)));
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g2.fillRect(x, y, iconW, iconH);
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}
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private static float luminance(Color c)
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{
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return (0.299f * c.getRed() + 0.587f * c.getGreen() + 0.114f * c.getBlue()) / 255f;
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}
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private void openAsset(AssetHandle asset)
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src/main/java/assets/AssetHandle.java
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src/main/java/assets/AssetHandle.java
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return null;
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}
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/** Whether to paint a checkerboard behind the thumbnail for transparency. */
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public boolean thumbnailHasCheckerboard()
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{
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return true;
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}
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/** Override in subclasses to provide a high-resolution thumbnail image. */
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protected Image loadThumbnail()
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{