Add color scale preview

sampler/src/main/java/atlantafx/sampler/page/QuickConfigMenu.java

@@ -139,6 +139,7 @@ public class QuickConfigMenu extends StackPane {
                     () -> FONT_SCALE.indexOf(fontScale.get()) <= 0, fontScale)
             );
 
+            // FIXME: Default zoom value is always 100% which isn't correct because it may have been changed earlier
             var zoomLabel = new Label();
             zoomLabel.textProperty().bind(Bindings.createStringBinding(() -> fontScale.get() + "%", fontScale));
 
@@ -149,7 +150,9 @@ public class QuickConfigMenu extends StackPane {
             final var tm = ThemeManager.getInstance();
             fontScale.addListener((obs, old, val) -> {
                 if (val != null) {
-                    double fontSize = ThemeManager.DEFAULT_FONT_SIZE / 100.0 * val.intValue();
+                    double fontSize = val.intValue() != 100 ?
+                            ThemeManager.DEFAULT_FONT_SIZE / 100.0 * val.intValue() :
+                            ThemeManager.DEFAULT_FONT_SIZE;
                     tm.setFontSize((int) Math.ceil(fontSize));
                     tm.reloadCustomCSS();
                 }

sampler/src/main/java/atlantafx/sampler/page/general/ColorPalette.java

@@ -1,9 +1,9 @@
 /* SPDX-License-Identifier: MIT */
 package atlantafx.sampler.page.general;
 
-import atlantafx.base.controls.Spacer;
 import atlantafx.base.theme.Styles;
-import javafx.application.Platform;
+import javafx.animation.KeyFrame;
+import javafx.animation.Timeline;
 import javafx.beans.property.ReadOnlyObjectProperty;
 import javafx.beans.property.ReadOnlyObjectWrapper;
 import javafx.geometry.Pos;
@@ -12,18 +12,20 @@ import javafx.scene.layout.GridPane;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.VBox;
 import javafx.scene.paint.Color;
+import javafx.util.Duration;
 
-import java.time.Duration;
+import java.util.ArrayList;
-import java.util.*;
+import java.util.List;
+import java.util.Objects;
 import java.util.function.Consumer;
 
 class ColorPalette extends VBox {
 
-    private final List<ColorBlock> blocks = new ArrayList<>();
+    private final List<ColorPaletteBlock> blocks = new ArrayList<>();
     private final ReadOnlyObjectWrapper<Color> bgBaseColor = new ReadOnlyObjectWrapper<>(Color.WHITE);
-    private final Consumer<ColorBlock> colorBlockActionHandler;
+    private final Consumer<ColorPaletteBlock> colorBlockActionHandler;
 
-    public ColorPalette(Consumer<ColorBlock> blockClickedHandler) {
+    public ColorPalette(Consumer<ColorPaletteBlock> blockClickedHandler) {
         super();
 
         this.colorBlockActionHandler = Objects.requireNonNull(blockClickedHandler);
@@ -35,7 +37,7 @@ class ColorPalette extends VBox {
         headerLabel.getStyleClass().add(Styles.TITLE_4);
 
         var headerBox = new HBox();
-        headerBox.getChildren().setAll(headerLabel, new Spacer());
+        headerBox.getChildren().setAll(headerLabel);
         headerBox.setAlignment(Pos.CENTER_LEFT);
         headerBox.getStyleClass().add("header");
 
@@ -85,8 +87,8 @@ class ColorPalette extends VBox {
         return grid;
     }
 
-    private ColorBlock colorBlock(String fgColor, String bgColor, String borderColor) {
+    private ColorPaletteBlock colorBlock(String fgColor, String bgColor, String borderColor) {
-        var block = new ColorBlock(fgColor, bgColor, borderColor, bgBaseColor.getReadOnlyProperty());
+        var block = new ColorPaletteBlock(fgColor, bgColor, borderColor, bgBaseColor.getReadOnlyProperty());
         block.setOnAction(colorBlockActionHandler);
         blocks.add(block);
         return block;
@@ -96,12 +98,9 @@ class ColorPalette extends VBox {
     // Unfortunately, JavaFX doesn't provide an API to observe when stylesheet changes has been applied.
     // The timer is introduced to defer widget update to a time when scene changes supposedly will be finished.
     public void updateColorInfo(Duration delay) {
-        new Timer().schedule(new TimerTask() {
+        var t = new Timeline(new KeyFrame(delay));
-            @Override
+        t.setOnFinished(e -> blocks.forEach(ColorPaletteBlock::update));
-            public void run() {
+        t.play();
-                Platform.runLater(() -> blocks.forEach(ColorBlock::update));
-            }
-        }, delay.toMillis());
     }
 
     public ReadOnlyObjectProperty<Color> bgBaseColorProperty() {

sampler/src/main/java/atlantafx/sampler/page/general/ColorPaletteBlock.java

@@ -20,7 +20,7 @@ import static atlantafx.sampler.page.general.ContrastChecker.*;
 import static atlantafx.sampler.util.JColorUtils.flattenColor;
 import static atlantafx.sampler.util.JColorUtils.getColorLuminance;
 
-class ColorBlock extends VBox {
+class ColorPaletteBlock extends VBox {
 
     private final String fgColorName;
     private final String bgColorName;
@@ -33,9 +33,9 @@ class ColorBlock extends VBox {
     private final Label wsagLabel = new Label();
     private final FontIcon expandIcon = new FontIcon(Feather.MAXIMIZE_2);
 
-    private Consumer<ColorBlock> actionHandler;
+    private Consumer<ColorPaletteBlock> actionHandler;
 
-    public ColorBlock(String fgColorName,
+    public ColorPaletteBlock(String fgColorName,
                              String bgColorName,
                              String borderColorName,
                              ReadOnlyObjectProperty<Color> bgBaseColor) {
@@ -150,7 +150,7 @@ class ColorBlock extends VBox {
         return borderColorName;
     }
 
-    public void setOnAction(Consumer<ColorBlock> actionHandler) {
+    public void setOnAction(Consumer<ColorPaletteBlock> actionHandler) {
         this.actionHandler = actionHandler;
     }
 }

sampler/src/main/java/atlantafx/sampler/page/general/ColorScale.java

@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: MIT */
+package atlantafx.sampler.page.general;
+
+import atlantafx.base.theme.Styles;
+import javafx.animation.KeyFrame;
+import javafx.animation.Timeline;
+import javafx.beans.property.ReadOnlyObjectWrapper;
+import javafx.geometry.Pos;
+import javafx.scene.control.Label;
+import javafx.scene.layout.FlowPane;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.VBox;
+import javafx.scene.paint.Color;
+import javafx.util.Duration;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ColorScale extends VBox {
+
+    private final ReadOnlyObjectWrapper<Color> bgBaseColor = new ReadOnlyObjectWrapper<>(Color.WHITE);
+    private final List<ColorScaleBlock> blocks = Arrays.asList(
+            ColorScaleBlock.forColorPrefix(bgBaseColor, "-color-gray-", 10),
+            ColorScaleBlock.forColorPrefix(bgBaseColor, "-color-blue-", 10),
+            ColorScaleBlock.forColorPrefix(bgBaseColor, "-color-green-", 10),
+            ColorScaleBlock.forColorPrefix(bgBaseColor, "-color-yellow-", 10),
+            ColorScaleBlock.forColorPrefix(bgBaseColor, "-color-red-", 10),
+            ColorScaleBlock.forColorName(bgBaseColor, "-color-black", "-color-white")
+    );
+
+    public ColorScale() {
+        super();
+        createView();
+    }
+
+    private void createView() {
+        var headerLabel = new Label("Color Scale");
+        headerLabel.getStyleClass().add(Styles.TITLE_4);
+
+        var headerBox = new HBox();
+        headerBox.getChildren().setAll(headerLabel);
+        headerBox.setAlignment(Pos.CENTER_LEFT);
+        headerBox.getStyleClass().add("header");
+
+        backgroundProperty().addListener((obs, old, val) -> bgBaseColor.set(
+                val != null && !val.getFills().isEmpty() ? (Color) val.getFills().get(0).getFill() : Color.WHITE
+        ));
+
+        setId("color-scale");
+        getChildren().setAll(
+                headerBox,
+                colorTable()
+        );
+    }
+
+    public void updateColorInfo(Duration delay) {
+        var t = new Timeline(new KeyFrame(delay));
+        t.setOnFinished(e -> blocks.forEach(ColorScaleBlock::update));
+        t.play();
+    }
+
+    private FlowPane colorTable() {
+        var root = new FlowPane(20, 20);
+        root.getStyleClass().add("table");
+        root.getChildren().setAll(blocks);
+        return root;
+    }
+}

sampler/src/main/java/atlantafx/sampler/page/general/ColorScaleBlock.java

@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: MIT */
+package atlantafx.sampler.page.general;
+
+import atlantafx.sampler.util.JColorUtils;
+import javafx.beans.property.ReadOnlyObjectProperty;
+import javafx.geometry.Pos;
+import javafx.scene.control.Label;
+import javafx.scene.layout.VBox;
+import javafx.scene.paint.Color;
+
+import static atlantafx.sampler.util.JColorUtils.flattenColor;
+import static atlantafx.sampler.util.JColorUtils.getColorLuminance;
+
+public class ColorScaleBlock extends VBox {
+
+    private static final double BLOCK_WIDTH = 250;
+    private static final double BLOCK_HEIGHT = 50;
+
+    private final ReadOnlyObjectProperty<Color> bgBaseColor;
+
+    private ColorScaleBlock(ReadOnlyObjectProperty<Color> bgBaseColor) {
+        super();
+
+        this.bgBaseColor = bgBaseColor;
+        createView();
+    }
+
+    private void addCell(String colorName) {
+        getChildren().add(label(colorName));
+    }
+
+    public void update() {
+        getChildren().forEach(c -> {
+            if (c instanceof Label label) {
+                String colorName = (String) label.getUserData();
+                label.setStyle(String.format("-fx-background-color:%s;-fx-text-fill:%s;",
+                        colorName,
+                        JColorUtils.toHexWithAlpha(getSafeFgColor(label))
+                ));
+            }
+        });
+    }
+
+    private void createView() {
+        getStyleClass().add("column");
+    }
+
+    private static Label label(String colorName) {
+        var label = new Label(colorName);
+        label.setMinHeight(BLOCK_HEIGHT);
+        label.setMinWidth(BLOCK_WIDTH);
+        label.setPrefWidth(BLOCK_WIDTH);
+        label.setMaxWidth(BLOCK_WIDTH);
+        label.setAlignment(Pos.CENTER_LEFT);
+        label.getStyleClass().add("cell");
+        label.setUserData(colorName);
+        label.setStyle(String.format("-fx-background-color:%s;", colorName));
+        return label;
+    }
+
+    private Color getSafeFgColor(Label label) {
+        var bg = getBgColor(label);
+        // deliberately reduce luminance threshold from 0.55 to 0.4
+        // to improve readability which is an experimental value anyway
+        return getColorLuminance(flattenColor(bgBaseColor.get(), bg)) < 0.4 ? Color.WHITE : Color.BLACK;
+    }
+
+    private Color getBgColor(Label label) {
+        return label.getBackground() != null && !label.getBackground().isEmpty() ?
+                (Color) label.getBackground().getFills().get(0).getFill() : Color.WHITE;
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+
+    public static ColorScaleBlock forColorPrefix(ReadOnlyObjectProperty<Color> bgBaseColor,
+                                                 String colorPrefix,
+                                                 int count) {
+        var block = new ColorScaleBlock(bgBaseColor);
+        for (int idx = 0; idx < count; idx++) {
+            block.addCell(colorPrefix + idx);
+        }
+        return block;
+    }
+
+    public static ColorScaleBlock forColorName(ReadOnlyObjectProperty<Color> bgBaseColor,
+                                               String... colors) {
+        var block = new ColorScaleBlock(bgBaseColor);
+        for (String colorName : colors) {
+            block.addCell(colorName);
+        }
+        return block;
+    }
+}

sampler/src/main/java/atlantafx/sampler/page/general/ContrastChecker.java

@@ -33,7 +33,7 @@ import org.kordamp.ikonli.material2.Material2AL;
 
 import java.util.Objects;
 
-import static atlantafx.sampler.page.general.ColorBlock.validateColorName;
+import static atlantafx.sampler.page.general.ColorPaletteBlock.validateColorName;
 import static atlantafx.sampler.util.JColorUtils.flattenColor;
 import static atlantafx.sampler.util.JColorUtils.getColorLuminance;
 

sampler/src/main/java/atlantafx/sampler/page/general/ThemePage.java

@@ -10,9 +10,9 @@ import javafx.geometry.HPos;
 import javafx.scene.control.ChoiceBox;
 import javafx.scene.control.Label;
 import javafx.scene.layout.GridPane;
+import javafx.util.Duration;
 import javafx.util.StringConverter;
 
-import java.time.Duration;
 import java.util.Objects;
 import java.util.function.Consumer;
 
@@ -20,7 +20,7 @@ public class ThemePage extends AbstractPage {
 
     public static final String NAME = "Theme";
 
-    private final Consumer<ColorBlock> colorBlockActionHandler = colorBlock -> {
+    private final Consumer<ColorPaletteBlock> colorBlockActionHandler = colorBlock -> {
         ContrastCheckerDialog dialog = getOrCreateContrastCheckerDialog();
         dialog.getContent().setValues(colorBlock.getFgColorName(),
                 colorBlock.getFgColor(),
@@ -32,6 +32,7 @@ public class ThemePage extends AbstractPage {
     };
 
     private final ColorPalette colorPalette = new ColorPalette(colorBlockActionHandler);
+    private final ColorScale colorScale = new ColorScale();
 
     private ContrastCheckerDialog contrastCheckerDialog;
 
@@ -44,7 +45,8 @@ public class ThemePage extends AbstractPage {
         ThemeManager.getInstance().addEventListener(e -> {
             if (e.eventType() == EventType.THEME_CHANGE || e.eventType() == EventType.CUSTOM_CSS_CHANGE) {
                 // only works for managed nodes
-                colorPalette.updateColorInfo(Duration.ofSeconds(1));
+                colorPalette.updateColorInfo(Duration.seconds(1));
+                colorScale.updateColorInfo(Duration.seconds(1));
             }
         });
     }
@@ -53,12 +55,14 @@ public class ThemePage extends AbstractPage {
     protected void onRendered() {
         super.onRendered();
         colorPalette.updateColorInfo(Duration.ZERO);
+        colorScale.updateColorInfo(Duration.ZERO);
     }
 
     private void createView() {
         userContent.getChildren().addAll(
                 optionsGrid(),
-                colorPalette
+                colorPalette,
+                colorScale
         );
         // if you want to enable quick menu don't forget that
         // theme selection choice box have to be updated accordingly

sampler/src/main/java/atlantafx/sampler/page/general/TypographyPage.java

@@ -6,7 +6,8 @@ import atlantafx.sampler.page.SampleBlock;
 import atlantafx.sampler.theme.ThemeEvent.EventType;
 import atlantafx.sampler.theme.ThemeManager;
 import atlantafx.sampler.util.NodeUtils;
-import javafx.application.Platform;
+import javafx.animation.KeyFrame;
+import javafx.animation.Timeline;
 import javafx.collections.FXCollections;
 import javafx.geometry.Pos;
 import javafx.scene.Node;
@@ -21,10 +22,7 @@ import javafx.scene.layout.VBox;
 import javafx.scene.text.Font;
 import javafx.scene.text.Text;
 import javafx.scene.text.TextFlow;
-
+import javafx.util.Duration;
-import java.time.Duration;
-import java.util.Timer;
-import java.util.TimerTask;
 
 import static atlantafx.base.theme.Styles.*;
 
@@ -46,7 +44,7 @@ public class TypographyPage extends AbstractPage {
         ThemeManager.getInstance().addEventListener(e -> {
             if (e.eventType() == EventType.FONT_FAMILY_CHANGE || e.eventType() == EventType.FONT_SIZE_CHANGE) {
                 // only works for managed nodes
-                updateFontInfo(Duration.ofMillis(1000));
+                updateFontInfo(Duration.seconds(1));
             }
         });
     }
@@ -116,7 +114,7 @@ public class TypographyPage extends AbstractPage {
             if (val != null) {
                 tm.setFontSize(val);
                 tm.reloadCustomCSS();
-                updateFontInfo(Duration.ofMillis(1000));
+                updateFontInfo(Duration.seconds(1));
             }
         });
 
@@ -130,10 +128,8 @@ public class TypographyPage extends AbstractPage {
     }
 
     private void updateFontInfo(Duration delay) {
-        new Timer().schedule(new TimerTask() {
+        var t = new Timeline(new KeyFrame(delay));
-            @Override
+        t.setOnFinished(e -> {
-            public void run() {
-                Platform.runLater(() -> {
             for (Node node : fontSizeSampleContent.getChildren()) {
                 if (node instanceof Text textNode) {
                     var font = textNode.getFont();
@@ -143,8 +139,7 @@ public class TypographyPage extends AbstractPage {
                 }
             }
         });
-            }
+        t.play();
-        }, delay.toMillis());
     }
 
     private SampleBlock fontSizeSample() {

sampler/src/main/resources/assets/styles/scss/layout/_overlay.scss

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 .overlay {
   -fx-background-color: transparent;
 

sampler/src/main/resources/assets/styles/scss/widgets/_color-palette.scss

@@ -9,10 +9,6 @@ $color-wsag-fg:        white;
   -fx-spacing: 20px;
   -fx-background-color: -color-bg-default; // mandatory base bg for flatten color calc
 
-  >.header {
-    -fx-pref-height: 40px;
-  }
-
   >.grid {
     -fx-vgap: 20px;
     -fx-hgap: 40px;

sampler/src/main/resources/assets/styles/scss/widgets/_color-scale.scss

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+
+#color-scale {
+  -fx-spacing: 20px;
+  -fx-background-color: -color-bg-default; // mandatory base bg for flatten color calc
+
+
+  >.table {
+    >.column {
+      >.cell {
+        -fx-text-fill: -color-fg-default;
+        -fx-font-size: 1.1em;
+        -fx-padding: 0 0 0 10px;
+      }
+    }
+  }
+}

sampler/src/main/resources/assets/styles/scss/widgets/_contrast-checker.scss

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 @use "color-palette" as palette;
 
 .contrast-checker {

sampler/src/main/resources/assets/styles/scss/widgets/_index.scss

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: MIT
 
 @use "color-palette";
+@use "color-scale";
 @use "contrast-checker";
 @use "quick-config-menu";