Cache Paints in drag buttons

app/src/main/java/org/solovyev/android/calculator/BaseActivity.java

@@ -96,7 +96,7 @@ public abstract class BaseActivity extends AppCompatActivity implements SharedPr
         if (view instanceof TextView) {
             final TextView textView = (TextView) view;
             final Typeface oldTypeface = textView.getTypeface();
-            if (oldTypeface == newTypeface) {
+            if (oldTypeface != null && oldTypeface.equals(newTypeface)) {
                 return;
             }
             final int style = oldTypeface != null ? oldTypeface.getStyle() : Typeface.NORMAL;

app/src/main/java/org/solovyev/android/calculator/keyboard/BaseKeyboardUi.java

@@ -1,5 +1,12 @@
 package org.solovyev.android.calculator.keyboard;
 
+import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
+import static android.view.HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING;
+import static android.view.HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING;
+import static android.view.HapticFeedbackConstants.KEYBOARD_TAP;
+import static org.solovyev.android.calculator.App.cast;
+import static org.solovyev.android.calculator.Preferences.Gui.Mode.simple;
+
 import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
@@ -40,13 +47,6 @@ import javax.inject.Inject;
 
 import dagger.Lazy;
 
-import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
-import static android.view.HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING;
-import static android.view.HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING;
-import static android.view.HapticFeedbackConstants.KEYBOARD_TAP;
-import static org.solovyev.android.calculator.App.cast;
-import static org.solovyev.android.calculator.Preferences.Gui.Mode.simple;
-
 public abstract class BaseKeyboardUi implements SharedPreferences.OnSharedPreferenceChangeListener, View.OnClickListener {
 
     public static float getTextScale(@NonNull Context context) {
@@ -212,7 +212,7 @@ public abstract class BaseKeyboardUi implements SharedPreferences.OnSharedPrefer
 
     private static class AdjusterHelper implements Adjuster.Helper<DirectionDragImageButton> {
 
-        public static AdjusterHelper instance = new AdjusterHelper();
+        public static final AdjusterHelper instance = new AdjusterHelper();
 
         @Override
         public void apply(@NonNull DirectionDragImageButton view, float textSize) {

app/src/main/java/org/solovyev/android/views/Adjuster.java

@@ -1,5 +1,7 @@
 package org.solovyev.android.views;
 
+import static android.graphics.Matrix.MSCALE_Y;
+
 import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
@@ -11,13 +13,11 @@ import android.view.ViewTreeObserver;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import static android.graphics.Matrix.MSCALE_Y;
-
 public class Adjuster {
 
     private static final float[] MATRIX = new float[9];
     @NonNull
-    private static Helper<TextView> textViewHelper = new Helper<TextView>() {
+    private static final Helper<TextView> textViewHelper = new Helper<TextView>() {
         @Override
         public void apply(@NonNull TextView view, float textSize) {
             view.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);

dragbutton/src/main/java/org/solovyev/android/views/dragbutton/DirectionDragButton.java

@@ -2,22 +2,14 @@ package org.solovyev.android.views.dragbutton;
 
 import android.content.Context;
 import android.graphics.Canvas;
+import android.graphics.Typeface;
 import android.support.annotation.ColorInt;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.text.TextPaint;
 import android.util.AttributeSet;
 
-import static android.graphics.Color.BLACK;
-import static android.util.TypedValue.COMPLEX_UNIT_DIP;
-import static android.util.TypedValue.applyDimension;
-import static org.solovyev.android.views.dragbutton.DirectionTextView.SHADOW_RADIUS_DPS;
-
 public class DirectionDragButton extends DragButton implements DirectionDragView {
     private final DirectionTextView textView = new DirectionTextView();
-    @NonNull
-    private final TextPaint baseTextPaint = new TextPaint();
-    private boolean highContrast;
 
     public DirectionDragButton(Context context) {
         super(context);
@@ -41,20 +33,11 @@ public class DirectionDragButton extends DragButton implements DirectionDragView
 
     private void init(@Nullable AttributeSet attrs) {
         textView.init(this, attrs);
-        baseTextPaint.set(getPaint());
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
-        final TextPaint paint = getPaint();
-        if (baseTextPaint.getTextSize() != paint.getTextSize() ||
-                baseTextPaint.getTypeface() != paint.getTypeface() ||
-                baseTextPaint.getColor() != paint.getColor() ||
-                baseTextPaint.getAlpha() != paint.getAlpha()) {
-            baseTextPaint.set(paint);
-            textView.setBaseTextPaint(paint);
-        }
         textView.draw(canvas);
     }
 
@@ -69,9 +52,21 @@ public class DirectionDragButton extends DragButton implements DirectionDragView
         return this;
     }
 
+    @Override
+    public void setTypeface(Typeface tf, int style) {
+        super.setTypeface(tf, style);
+        textView.setTypeface(getPaint().getTypeface());
+    }
+
+    @Override
+    public void setTextSize(int unit, float size) {
+        super.setTextSize(unit, size);
+        textView.setTextSize(getPaint().getTextSize());
+    }
+
     @Override
     @NonNull
-    public DirectionTextView.Text getText(@NonNull DragDirection direction) {
+    public DirectionText getText(@NonNull DragDirection direction) {
         return textView.getText(direction);
     }
 
@@ -93,15 +88,6 @@ public class DirectionDragButton extends DragButton implements DirectionDragView
 
     @Override
     public void setHighContrast(boolean highContrast) {
-        if(this.highContrast == highContrast) {
+        textView.setHighContrast(highContrast);
-            return;
-        }
-        this.highContrast = highContrast;
-        this.textView.setHighContrast(highContrast);
-        if (highContrast && DirectionTextView.needsShadow(getCurrentTextColor())) {
-            setShadowLayer(applyDimension(COMPLEX_UNIT_DIP, SHADOW_RADIUS_DPS, getResources().getDisplayMetrics()), 0, 0, BLACK);
-        } else {
-            setShadowLayer(0, 0, 0, BLACK);
-        }
     }
 }

dragbutton/src/main/java/org/solovyev/android/views/dragbutton/DirectionDragImageButton.java

@@ -5,13 +5,11 @@ import android.graphics.Canvas;
 import android.graphics.Typeface;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.text.TextPaint;
 import android.util.AttributeSet;
 import android.widget.TextView;
 
 public class DirectionDragImageButton extends DragImageButton implements DirectionDragView {
     private final DirectionTextView textView = new DirectionTextView();
-    private final TextPaint baseTextPaint = new TextPaint();
 
     public DirectionDragImageButton(Context context) {
         super(context);
@@ -35,8 +33,7 @@ public class DirectionDragImageButton extends DragImageButton implements Directi
 
     private void init(@Nullable AttributeSet attrs) {
         final TextView view = new TextView(getContext(), attrs);
-        baseTextPaint.set(view.getPaint());
+        textView.init(this, attrs, view.getPaint());
-        textView.init(this, attrs, baseTextPaint);
     }
 
     @Override
@@ -46,29 +43,24 @@ public class DirectionDragImageButton extends DragImageButton implements Directi
     }
 
     @NonNull
-    public DirectionTextView.Text getText(@NonNull DragDirection direction) {
+    public DirectionText getText(@NonNull DragDirection direction) {
         return textView.getText(direction);
     }
 
-    public void setTypeface(@NonNull Typeface newTypeface) {
+    public void setTypeface(@NonNull Typeface typeface) {
-        final Typeface oldTypeface = baseTextPaint.getTypeface();
+        textView.setTypeface(typeface);
-        if (oldTypeface == newTypeface) {
-            return;
-        }
-        baseTextPaint.setTypeface(newTypeface);
-        textView.setBaseTextPaint(baseTextPaint);
     }
 
-    public void setTextSize(float textSizePxs) {
+    public void setTextSize(float textSize) {
-        baseTextPaint.setTextSize(textSizePxs);
+        textView.setTextSize(textSize);
-        textView.setBaseTextPaint(baseTextPaint);
     }
 
     public float getTextSize() {
-        return baseTextPaint.getTextSize();
+        return textView.getTextSize();
     }
 
     @Override
     public void setHighContrast(boolean highContrast) {
+        textView.setHighContrast(highContrast);
     }
 }

dragbutton/src/main/java/org/solovyev/android/views/dragbutton/DirectionDragView.java

@@ -4,5 +4,5 @@ import android.support.annotation.NonNull;
 
 public interface DirectionDragView extends DragView {
     @NonNull
-    DirectionTextView.Text getText(@NonNull DragDirection direction);
+    DirectionText getText(@NonNull DragDirection direction);
 }

dragbutton/src/main/java/org/solovyev/android/views/dragbutton/DirectionText.java

@@ -0,0 +1,200 @@
+package org.solovyev.android.views.dragbutton;
+
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.graphics.Typeface;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.text.TextUtils;
+import android.view.View;
+
+public class DirectionText {
+
+    static final float DEF_SCALE = 0.4f;
+    private static final Rect TMP = new Rect();
+    @NonNull
+    private final DragDirection direction;
+    @NonNull
+    private final View view;
+    private final float minTextSize;
+    @NonNull
+    private final PointF offset = new PointF(Integer.MIN_VALUE, Integer.MIN_VALUE);
+    @NonNull
+    private final PaintCache paintCache;
+    @NonNull
+    private PaintCache.Entry entry;
+    @NonNull
+    private String value = "";
+    private boolean visible = true;
+    private int padding;
+    private float scale;
+    private float baseTextSize;
+
+    public DirectionText(@NonNull DragDirection direction, @NonNull View view,
+            float minTextSize) {
+        this.direction = direction;
+        this.view = view;
+        this.minTextSize = minTextSize;
+        this.paintCache = PaintCache.get();
+    }
+
+    public void init(@Nullable TypedArray array, float defScale,
+            int defColor, float defAlpha, int defPadding, @NonNull Typeface defTypeface,
+            float textSize) {
+        baseTextSize = textSize;
+        if (array != null) {
+            if (array.hasValue(direction.textAttr)) {
+                value = nullToEmpty(array.getString(direction.textAttr));
+            }
+            padding = array.getDimensionPixelSize(direction.paddingAttr, defPadding);
+            scale = array.getFloat(direction.scaleAttr, defScale);
+        } else {
+            value = "";
+            scale = defScale;
+            padding = defPadding;
+        }
+        final PaintCache.Spec spec = new PaintCache.Spec(defColor, defAlpha,
+                defTypeface, scaledTextSize(textSize, scale), false);
+        entry = paintCache.get(view.getContext(), spec);
+    }
+
+    @NonNull
+    private String nullToEmpty(@Nullable String s) {
+        return s == null ? "" : s;
+    }
+
+    private float scaledTextSize(float textSize, float scale) {
+        return Math.max(textSize * scale, minTextSize);
+    }
+
+    public void setVisible(boolean visible) {
+        if (this.visible == visible) {
+            return;
+        }
+        this.visible = visible;
+        invalidate(false);
+    }
+
+    private void invalidate(boolean remeasure) {
+        view.invalidate();
+        if (remeasure) {
+            offset.set(Integer.MIN_VALUE, Integer.MIN_VALUE);
+        }
+    }
+
+    public void setColor(int color) {
+        setColor(color, entry.spec.alpha);
+    }
+
+    private void setColor(int color, float alpha) {
+        if (entry.spec.color == color && entry.spec.alpha == alpha) {
+            return;
+        }
+        entry = paintCache.get(view.getContext(), entry.spec.color(color, alpha));
+        invalidate(false);
+    }
+
+    public void setAlpha(float alpha) {
+        setColor(entry.spec.color, alpha);
+    }
+
+    void setHighContrast(boolean highContrast) {
+        if (entry.spec.highContrast == highContrast) {
+            return;
+        }
+        entry = paintCache.get(view.getContext(), entry.spec.highContrast(highContrast));
+        invalidate(false);
+    }
+
+    public void setTypeface(@NonNull Typeface typeface) {
+        if (entry.spec.typeface.equals(typeface)) {
+            return;
+        }
+        entry = paintCache.get(view.getContext(), entry.spec.typeface(typeface));
+        invalidate(true);
+    }
+
+    void draw(@NonNull Canvas canvas) {
+        if (!hasValue()) {
+            return;
+        }
+        if (offset.x == Integer.MIN_VALUE || offset.y == Integer.MIN_VALUE) {
+            calculatePosition();
+        }
+        final int width = view.getWidth();
+        final int height = view.getHeight();
+        switch (direction) {
+            case up:
+                canvas.drawText(value, width + offset.x, offset.y, entry.paint);
+                break;
+            case down:
+                canvas.drawText(value, width + offset.x, height + offset.y, entry.paint);
+                break;
+            case left:
+                canvas.drawText(value, offset.x, height / 2 + offset.y, entry.paint);
+                break;
+            case right:
+                canvas.drawText(value, width + offset.x, height / 2 + offset.y, entry.paint);
+                break;
+        }
+    }
+
+    boolean hasValue() {
+        return visible && !TextUtils.isEmpty(value);
+    }
+
+    private void calculatePosition() {
+        TMP.setEmpty();
+        entry.paint.getTextBounds(value, 0, value.length(), TMP);
+
+        final int paddingLeft = padding;
+        final int paddingRight = padding;
+        final int paddingTop = padding;
+        final int paddingBottom = padding;
+
+        switch (direction) {
+            case up:
+            case down:
+                offset.x = -paddingLeft - TMP.width() - TMP.left;
+                if (direction == DragDirection.up) {
+                    offset.y = paddingTop + entry.getFixedTextHeight(scaledTextSize(baseTextSize, DEF_SCALE));
+                } else {
+                    offset.y = -paddingBottom;
+                }
+                break;
+            case left:
+            case right:
+                if (direction == DragDirection.left) {
+                    offset.x = paddingLeft;
+                } else {
+                    offset.x = -paddingRight - TMP.width();
+                }
+                offset.y = (paddingTop - paddingBottom) / 2 + entry.getFixedTextHeight(scaledTextSize(baseTextSize, DEF_SCALE)) / 2;
+                break;
+        }
+    }
+
+    @NonNull
+    public String getValue() {
+        return visible ? value : "";
+    }
+
+    public void setValue(@NonNull String value) {
+        if (TextUtils.equals(this.value, value)) {
+            return;
+        }
+        this.value = value;
+        invalidate(true);
+    }
+
+    public void setBaseTextSize(float baseTextSize) {
+        if (this.baseTextSize == baseTextSize) {
+            return;
+        }
+        this.baseTextSize = baseTextSize;
+        entry = paintCache.get(view.getContext(), entry.spec.textSize(scaledTextSize(baseTextSize, scale)));
+        invalidate(true);
+    }
+}

dragbutton/src/main/java/org/solovyev/android/views/dragbutton/DirectionTextView.java

@@ -1,18 +1,13 @@
 package org.solovyev.android.views.dragbutton;
 
 import android.content.Context;
+import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Canvas;
-import android.graphics.PointF;
-import android.graphics.Rect;
 import android.graphics.Typeface;
-import android.support.annotation.ColorInt;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.graphics.ColorUtils;
 import android.text.TextPaint;
-import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.TextView;
@@ -20,297 +15,84 @@ import android.widget.TextView;
 import java.util.EnumMap;
 import java.util.Map;
 
-import static android.graphics.Color.BLACK;
+class DirectionTextView {
-import static android.util.TypedValue.COMPLEX_UNIT_DIP;
-import static android.util.TypedValue.applyDimension;
 
-public class DirectionTextView {
+    static final float SHADOW_RADIUS_DPS = 2;
-
+    private static final float DEF_ALPHA = 0.4f;
-    public static final float DEF_ALPHA = 0.4f;
-    public static final float DEF_SCALE = 0.4f;
-    public static final float SHADOW_RADIUS_DPS = 2;
 
     @NonNull
-    private final Map<DragDirection, Text> texts = new EnumMap<>(DragDirection.class);
+    private final Map<DragDirection, DirectionText> texts = new EnumMap<>(DragDirection.class);
+    private float textSize;
+    private Typeface typeface;
 
-    public DirectionTextView() {
+    DirectionTextView() {
     }
 
     public void init(@NonNull TextView view, @Nullable AttributeSet attrs) {
         init(view, attrs, view.getPaint());
     }
 
-    public void setBaseTextPaint(@NonNull TextPaint baseTextPaint) {
+    public void init(@NonNull View view, @Nullable AttributeSet attrs, @NonNull TextPaint base) {
-        for (Text text : texts.values()) {
+        textSize = base.getTextSize();
-            text.initPaint(baseTextPaint);
+        typeface = base.getTypeface() == null ? Typeface.DEFAULT : base.getTypeface();
-        }
-    }
 
-    public void init(@NonNull View view, @Nullable AttributeSet attrs, @NonNull TextPaint baseTextPaint) {
         final Context context = view.getContext();
-        final int defColor = baseTextPaint.getColor();
+        final Resources res = context.getResources();
-        final int defPadding = context.getResources().getDimensionPixelSize(R.dimen.drag_direction_text_default_padding);
-        final float minTextSize = context.getResources().getDimensionPixelSize(R.dimen.drag_direction_text_min_size);
 
-
+        final float minTextSize =
-        if (attrs == null) {
+                res.getDimensionPixelSize(R.dimen.drag_direction_text_min_size);
-            for (DragDirection direction : DragDirection.values()) {
+        final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DirectionText);
-                final Text text = new Text(direction, view, minTextSize);
+        final float scale =
-                text.init(baseTextPaint, null, DEF_SCALE, defColor, DEF_ALPHA, defPadding);
+                a.getFloat(R.styleable.DirectionText_directionTextScale, DirectionText.DEF_SCALE);
-                texts.put(direction, text);
+        final float alpha = a.getFloat(R.styleable.DirectionText_directionTextAlpha, DEF_ALPHA);
-            }
+        final int color = a.getColor(R.styleable.DirectionText_directionTextColor, base.getColor());
-            return;
+        final int padding = a.getDimensionPixelSize(R.styleable.DirectionText_directionTextPadding,
-        }
+                res.getDimensionPixelSize(R.dimen.drag_direction_text_default_padding));
-        final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.DirectionText);
-        final float scale = array.getFloat(R.styleable.DirectionText_directionTextScale, DEF_SCALE);
-        final float alpha = array.getFloat(R.styleable.DirectionText_directionTextAlpha, DEF_ALPHA);
-        final int color = array.getColor(R.styleable.DirectionText_directionTextColor, defColor);
-        final int padding = array.getDimensionPixelSize(R.styleable.DirectionText_directionTextPadding, defPadding);
         for (DragDirection direction : DragDirection.values()) {
-            final Text text = new Text(direction, view, minTextSize);
+            final DirectionText text = new DirectionText(direction, view, minTextSize);
-            text.init(baseTextPaint, array, scale, color, alpha, padding);
+            text.init(a, scale, color, alpha, padding, typeface, textSize);
             texts.put(direction, text);
         }
-        array.recycle();
+        a.recycle();
     }
 
-    public void draw(@NonNull Canvas canvas) {
+    void draw(@NonNull Canvas canvas) {
-        for (Text text : texts.values()) {
+        for (DirectionText text : texts.values()) {
             text.draw(canvas);
         }
     }
 
     @NonNull
-    public Text getText(@NonNull DragDirection direction) {
+    public DirectionText getText(@NonNull DragDirection direction) {
         return texts.get(direction);
     }
 
-    public void setHighContrast(boolean highContrast) {
+    void setHighContrast(boolean highContrast) {
-        for (Text text : texts.values()) {
+        for (DirectionText text : texts.values()) {
             text.setHighContrast(highContrast);
         }
     }
 
-    public static class Text {
+    public void setTypeface(@NonNull Typeface typeface) {
-        public final Rect bounds = new Rect();
+        if(this.typeface == typeface) {
-        @NonNull
+            return;
-        private final TextPaint paint = new TextPaint();
-        @NonNull
-        private final DragDirection direction;
-        @NonNull
-        private final View view;
-        private final float minTextSize;
-        @NonNull
-        private final PointF offset = new PointF(0, 0);
-        private float fixedTextHeight = 0;
-        @NonNull
-        private String value = "";
-        private float scale;
-        private int color;
-        private int contrastColor;
-        private float alpha;
-        private boolean visible = true;
-        private boolean highContrast;
-        private int padding;
-
-        public Text(@NonNull DragDirection direction, @NonNull View view, float minTextSize) {
-            this.direction = direction;
-            this.view = view;
-            this.minTextSize = minTextSize;
         }
-
+        for (DirectionText text : texts.values()) {
-        public void init(@NonNull TextPaint base, @Nullable TypedArray array, float defScale, int defColor, float defAlpha, int defPadding) {
+            text.setTypeface(typeface);
-            if (array != null) {
-                if (array.hasValue(direction.textAttr)) {
-                    value = nullToEmpty(array.getString(direction.textAttr));
-                }
-                padding = array.getDimensionPixelSize(direction.paddingAttr, defPadding);
-                scale = array.getFloat(direction.scaleAttr, defScale);
-            } else {
-                value = "";
-                scale = defScale;
-                padding = defPadding;
-            }
-            alpha = defAlpha;
-            color = defColor;
-            contrastColor = makeContrastColor(color);
-            initPaint(base);
-        }
-
-        @NonNull
-        private String nullToEmpty(@Nullable String s) {
-            return s == null ? "" : s;
-        }
-
-        private int makeContrastColor(int color) {
-            final int colorRes = isLightColor(color) ? R.color.drag_button_text : R.color.drag_text_inverse;
-            return ContextCompat.getColor(view.getContext(), colorRes);
-        }
-
-        public void initPaint(@NonNull TextPaint base) {
-            paint.set(base);
-            paint.setColor(color);
-            paint.setAlpha(intAlpha());
-            final Typeface typeface = base.getTypeface();
-            if (typeface != null && typeface.getStyle() != Typeface.NORMAL) {
-                paint.setTypeface(Typeface.create(typeface, Typeface.NORMAL));
-            }
-
-            // pre-calculate fixed height
-            paint.setTextSize(Math.max(base.getTextSize() * DEF_SCALE, minTextSize));
-            paint.getTextBounds("|", 0, 1, bounds);
-            fixedTextHeight = bounds.height();
-
-            // set real text size value
-            paint.setTextSize(Math.max(base.getTextSize() * scale, minTextSize));
-
-            initPaintShadow();
-            invalidate(true);
-        }
-
-        private void initPaintShadow() {
-            if (highContrast && needsShadow(color)) {
-                paint.setShadowLayer(applyDimension(COMPLEX_UNIT_DIP, SHADOW_RADIUS_DPS, view.getResources().getDisplayMetrics()), 0, 0, BLACK);
-            } else {
-                paint.setShadowLayer(0, 0, 0, BLACK);
-            }
-        }
-
-        private int intAlpha() {
-            return (int) (255 * alpha);
-        }
-
-        public void setVisible(boolean visible) {
-            if (this.visible == visible) {
-                return;
-            }
-            this.visible = visible;
-            invalidate(false);
-        }
-
-        public void setColor(int color) {
-            setColor(color, alpha);
-        }
-
-        public void setAlpha(float alpha) {
-            setColor(color, alpha);
-        }
-
-        public void setHighContrast(boolean highContrast) {
-            if (this.highContrast == highContrast) {
-                return;
-            }
-            this.highContrast = highContrast;
-            initPaintShadow();
-            invalidate(false);
-        }
-
-        public void setColor(int color, float alpha) {
-            if (this.color == color && this.alpha == alpha) {
-                return;
-            }
-            this.color = color;
-            this.contrastColor = makeContrastColor(color);
-            this.alpha = alpha;
-            paint.setColor(color);
-            paint.setAlpha(intAlpha());
-            initPaintShadow();
-            invalidate(false);
-        }
-
-        private void invalidate(boolean remeasure) {
-            view.invalidate();
-            if (remeasure) {
-                offset.set(0, 0);
-            }
-        }
-
-        public void draw(@NonNull Canvas canvas) {
-            if (!hasValue()) {
-                return;
-            }
-            if (offset.x == 0 && offset.y == 0) {
-                calculatePosition();
-            }
-            if (highContrast) {
-                paint.setColor(contrastColor);
-                paint.setAlpha(255);
-            }
-            final int width = view.getWidth();
-            final int height = view.getHeight();
-            switch (direction) {
-                case up:
-                    canvas.drawText(value, width + offset.x, offset.y, paint);
-                    break;
-                case down:
-                    canvas.drawText(value, width + offset.x, height + offset.y, paint);
-                    break;
-                case left:
-                    canvas.drawText(value, offset.x, height / 2 + offset.y, paint);
-                    break;
-                case right:
-                    canvas.drawText(value, width + offset.x, height / 2 + offset.y, paint);
-                    break;
-            }
-            if (highContrast) {
-                paint.setColor(color);
-                paint.setAlpha(intAlpha());
-            }
-        }
-
-        private void calculatePosition() {
-            paint.getTextBounds(value, 0, value.length(), bounds);
-
-            final int paddingLeft = padding;
-            final int paddingRight = padding;
-            final int paddingTop = padding;
-            final int paddingBottom = padding;
-
-            switch (direction) {
-                case up:
-                case down:
-                    offset.x = -paddingLeft - bounds.width() - bounds.left;
-                    if (direction == DragDirection.up) {
-                        offset.y = paddingTop + fixedTextHeight;
-                    } else {
-                        offset.y = -paddingBottom;
-                    }
-                    break;
-                case left:
-                case right:
-                    if (direction == DragDirection.left) {
-                        offset.x = paddingLeft;
-                    } else {
-                        offset.x = -paddingRight - bounds.width();
-                    }
-                    offset.y = (paddingTop - paddingBottom) / 2 + fixedTextHeight / 2;
-                    break;
-            }
-        }
-
-        @NonNull
-        public String getValue() {
-            return visible ? value : "";
-        }
-
-        public void setValue(@NonNull String value) {
-            if (TextUtils.equals(this.value, value)) {
-                return;
-            }
-            this.value = value;
-            invalidate(true);
-        }
-
-        public boolean hasValue() {
-            return visible && !TextUtils.isEmpty(value);
         }
     }
 
-    private static boolean isLightColor(@ColorInt int color) {
+    public float getTextSize() {
-        return ColorUtils.calculateLuminance(color) > 0.5f;
+        return textSize;
     }
 
-    public static boolean needsShadow(@ColorInt int color) {
+    public void setTextSize(float textSize) {
-        return isLightColor(color);
+        if (this.textSize == textSize) {
+            return;
+        }
+        this.textSize = textSize;
+        for (DirectionText text : texts.values()) {
+            text.setBaseTextSize(textSize);
+        }
     }
 }

dragbutton/src/main/java/org/solovyev/android/views/dragbutton/PaintCache.java

@@ -0,0 +1,215 @@
+package org.solovyev.android.views.dragbutton;
+
+import static android.graphics.Color.BLACK;
+import static android.util.TypedValue.COMPLEX_UNIT_DIP;
+import static android.util.TypedValue.applyDimension;
+import static org.solovyev.android.views.dragbutton.DirectionTextView.SHADOW_RADIUS_DPS;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.Typeface;
+import android.support.annotation.ColorInt;
+import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
+import android.support.v4.graphics.ColorUtils;
+import android.util.Log;
+
+import java.util.HashMap;
+import java.util.Map;
+
+class PaintCache {
+
+    @NonNull
+    private static final Rect TMP = new Rect();
+    private static final String TAG = "PaintCache";
+    @NonNull
+    private static final PaintCache INSTANCE = new PaintCache();
+
+    static class Entry {
+        @NonNull
+        public final Spec spec;
+        @NonNull
+        public final Paint paint;
+        private float lastTextSize;
+        private float fixedTextHeight;
+
+        Entry(@NonNull Spec spec, @NonNull Paint paint) {
+            this.spec = spec;
+            this.paint = paint;
+        }
+
+        float getFixedTextHeight(float textSize) {
+            if (lastTextSize == textSize) {
+                return fixedTextHeight;
+            }
+            if (lastTextSize != 0) {
+                Log.d(TAG, "Remeasuring text for size: " + textSize);
+            }
+            final float oldTextSize = paint.getTextSize();
+            paint.setTextSize(textSize);
+            TMP.setEmpty();
+            paint.getTextBounds("|", 0, 1, TMP);
+            paint.setTextSize(oldTextSize);
+            lastTextSize = textSize;
+            fixedTextHeight = TMP.height();
+            return fixedTextHeight;
+        }
+    }
+
+    static class Spec {
+        @ColorInt
+        public final int color;
+        public final float alpha;
+        @NonNull
+        public final Typeface typeface;
+        public final float textSize;
+        public final boolean highContrast;
+
+        Spec(int color, float alpha, @NonNull Typeface typeface,
+                float textSize,
+                boolean highContrast) {
+            this.color = color;
+            this.alpha = alpha;
+            this.typeface = typeface;
+            this.textSize = textSize;
+            this.highContrast = highContrast;
+        }
+
+        private int contrastColor(@NonNull Context context) {
+            final int colorRes =
+                    isLightColor(color) ? R.color.drag_button_text : R.color.drag_text_inverse;
+            return ContextCompat.getColor(context, colorRes);
+        }
+
+        private static boolean isLightColor(@ColorInt int color) {
+            return ColorUtils.calculateLuminance(color) > 0.5f;
+        }
+
+        private int intAlpha() {
+            return (int) (255 * alpha);
+        }
+
+        private boolean needsShadow() {
+            return needsShadow(color);
+        }
+
+        public static boolean needsShadow(@ColorInt int color) {
+            return isLightColor(color);
+        }
+
+        @Override
+        public int hashCode() {
+            int result = color;
+            result = 31 * result + (alpha != +0.0f ? Float.floatToIntBits(alpha) : 0);
+            result = 31 * result + typeface.hashCode();
+            result = 31 * result + (textSize != +0.0f ? Float.floatToIntBits(textSize) : 0);
+            result = 31 * result + (highContrast ? 1 : 0);
+            return result;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+
+            final Spec spec = (Spec) o;
+
+            if (color != spec.color) return false;
+            if (Float.compare(spec.alpha, alpha) != 0) return false;
+            if (Float.compare(spec.textSize, textSize) != 0) return false;
+            if (highContrast != spec.highContrast) return false;
+            return typeface.equals(spec.typeface);
+
+        }
+
+        @NonNull
+        public Spec highContrast(boolean highContrast) {
+            return new Spec(color, alpha, typeface, textSize, highContrast);
+        }
+
+        @NonNull
+        public Spec color(int color, float alpha) {
+            return new Spec(color, alpha, typeface, textSize, highContrast);
+        }
+
+        @NonNull
+        public Spec typeface(@NonNull Typeface typeface) {
+            return new Spec(color, alpha, typeface, textSize, highContrast);
+        }
+
+        @NonNull
+        public Spec textSize(float textSize) {
+            return new Spec(color, alpha, typeface, textSize, highContrast);
+        }
+
+        @Override
+        public String toString() {
+            return "Spec{" +
+                    "color=" + color +
+                    ", alpha=" + alpha +
+                    ", typeface=" + System.identityHashCode(typeface) +
+                    ", textSize=" + textSize +
+                    ", highContrast=" + highContrast +
+                    '}';
+        }
+    }
+
+    private float shadowRadius;
+    @NonNull
+    private final Map<Spec, Entry> map = new HashMap<>();
+
+    private void lazyLoad(@NonNull Context context) {
+        if (shadowRadius != 0) {
+            return;
+        }
+        final Resources res = context.getResources();
+        shadowRadius = applyDimension(COMPLEX_UNIT_DIP, SHADOW_RADIUS_DPS,
+                res.getDisplayMetrics());
+    }
+
+    @NonNull
+    public static PaintCache get() {
+        return INSTANCE;
+    }
+
+    @NonNull
+    public Entry get(@NonNull Context context, @NonNull Spec spec) {
+        lazyLoad(context);
+        Entry entry = map.get(spec);
+        if (entry == null) {
+            entry = new Entry(spec, makePaint(context, spec));
+            map.put(spec, entry);
+        } else {
+            Log.d(TAG, "Reusing paint for spec: " + spec);
+        }
+        return entry;
+    }
+
+    @NonNull
+    private Paint makePaint(@NonNull Context context, @NonNull Spec spec) {
+        Log.d(TAG, "Creating new paint for spec: " + spec);
+        final Paint paint = new Paint();
+        paint.setAntiAlias(true);
+        if (spec.highContrast) {
+            paint.setColor(spec.contrastColor(context));
+            paint.setAlpha(255);
+        } else {
+            paint.setColor(spec.color);
+            paint.setAlpha(spec.intAlpha());
+        }
+        if (spec.typeface.getStyle() != Typeface.NORMAL) {
+            paint.setTypeface(Typeface.create(spec.typeface, Typeface.NORMAL));
+        } else {
+            paint.setTypeface(spec.typeface);
+        }
+        paint.setTextSize(spec.textSize);
+        if (spec.highContrast && spec.needsShadow()) {
+            paint.setShadowLayer(shadowRadius, 0, 0, BLACK);
+        } else {
+            paint.setShadowLayer(0, 0, 0, BLACK);
+        }
+        return paint;
+    }
+}