Add source

app/src/main/AndroidManifest.xml

@@ -20,6 +20,7 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
     <application
+        android:name="com.hippo.ehviewer.EhApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"

app/src/main/java/com/hippo/ehviewer/EhApplication.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer;
+
+import android.app.Application;
+
+import com.hippo.util.UiUtils;
+
+public class EhApplication extends Application {
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+
+        UiUtils.init(this);
+    }
+}

app/src/main/java/com/hippo/util/UiUtils.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Color;
+
+public class UiUtils {
+
+    private static float sDensity;
+    private static float sScaledDensity;
+
+    /**
+     * Init UiUtils. Do is in Application.onCreate()
+     *
+     * @param context
+     */
+    public static void init(Context context) {
+        Resources resources = context.getResources();
+
+        sDensity = resources.getDisplayMetrics().density;
+        sScaledDensity = resources.getDisplayMetrics().scaledDensity;
+    }
+
+    /**
+     * dp conversion to pix
+     *
+     * @param dp The value you want to conversion
+     * @return value in pix
+     */
+    public static int dp2pix(float dp) {
+        return (int) (sDensity * dp + 0.5f);
+    }
+
+    /**
+     * pix conversion to dp
+     *
+     * @param pix The value you want to conversion
+     * @return value in dp
+     */
+    public static float pix2dp(int pix) {
+        return pix / sDensity;
+    }
+
+    /**
+     * sp conversion to pix
+     *
+     * @param sp The value you want to conversion
+     * @return value in pix
+     */
+    public static int sp2pix(float sp) {
+        return (int) (sp * sScaledDensity + 0.5f);
+    }
+
+    /**
+     * pix conversion to sp
+     *
+     * @param pix The value you want to conversion
+     * @return value in sp
+     */
+    public static float pix2sp(float pix) {
+        return pix / sScaledDensity;
+    }
+
+    /**
+     * get darker color of target color, alpha not change
+     * @param color the color you want to make it darker
+     * @return new darker color
+     */
+    public static int getDarkerColor(int color) {
+        float[] hsv = new float[3];
+        Color.colorToHSV(color, hsv);
+        hsv[2] *= 0.9f;
+        return Color.HSVToColor(hsv);
+    }
+}

app/src/main/java/com/hippo/util/ViewUtils.java

@@ -245,4 +245,31 @@ public final class ViewUtils {
         return result | (childMeasuredState&MEASURED_STATE_MASK);
     }
 
+    /**
+     * Utility to return a default size. Uses the supplied size if the
+     * MeasureSpec imposed no constraints. Will get suitable if allowed
+     * by the MeasureSpec.
+     *
+     * @param size Default size for this view
+     * @param measureSpec Constraints imposed by the parent
+     * @return The size this view should be.
+     */
+    public static int getSuitableSize(int size, int measureSpec) {
+        int result = size;
+        int specMode = View.MeasureSpec.getMode(measureSpec);
+        int specSize = View.MeasureSpec.getSize(measureSpec);
+
+        switch (specMode) {
+            case View.MeasureSpec.UNSPECIFIED:
+                result = size;
+                break;
+            case View.MeasureSpec.EXACTLY:
+                result = specSize;
+                break;
+            case View.MeasureSpec.AT_MOST:
+                result = size == 0 ? specSize : size;
+        }
+        return result;
+    }
+
 }

app/src/main/java/com/hippo/widget/FloatingActionButton.java

@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.widget;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.hippo.util.UiUtils;
+import com.hippo.util.ViewUtils;
+
+public class FloatingActionButton extends View {
+
+    private static final int[] BACKGROUND_ATTR = {android.R.attr.colorBackground};
+    private static final int[] DRAWABLE_ATTR = {android.R.attr.drawable};
+
+    private static final int DRAWABLE_WIDTH = UiUtils.dp2pix(24);
+
+    private GasketDrawer mGasketDrawer;
+    private Drawable mDrawable;
+
+    public FloatingActionButton(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs, 0, 0);
+    }
+
+    public FloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context, attrs, defStyleAttr, 0);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public FloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        init(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    private void init(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        TypedArray a;
+
+        // Background color
+        a = context.obtainStyledAttributes(attrs, BACKGROUND_ATTR, defStyleAttr, defStyleRes);
+        int bgColor = a.getColor(0, Color.BLACK);
+        a.recycle();
+
+        // Drawable
+        a = context.obtainStyledAttributes(attrs, DRAWABLE_ATTR, defStyleAttr, defStyleRes);
+        mDrawable = a.getDrawable(0);
+        a.recycle();
+
+        mGasketDrawer = new GasketDrawer(this, bgColor);
+    }
+
+    protected void drawableStateChanged() {
+        int[] stateSet = getDrawableState();
+        mGasketDrawer.onStateChange(stateSet);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        setMeasuredDimension(ViewUtils.getSuitableSize(getSuggestedMinimumWidth(), widthMeasureSpec),
+                ViewUtils.getSuitableSize(getSuggestedMinimumHeight(), heightMeasureSpec));
+    }
+
+    protected void onDraw(Canvas canvas) {
+        mGasketDrawer.draw(canvas);
+
+        if (mDrawable != null) {
+            int left;
+            int top;
+            int right;
+            int bottom;
+            int width = getWidth();
+            int height = getHeight();
+            int halfDrawableWidth = DRAWABLE_WIDTH / 2;
+            left = width / 2 - halfDrawableWidth;
+            top = height / 2 - halfDrawableWidth;
+            right = left + DRAWABLE_WIDTH;
+            bottom = top + DRAWABLE_WIDTH;
+            mDrawable.setBounds(left, top, right, bottom);
+            mDrawable.draw(canvas);
+        }
+    }
+
+    public void setColor(int color) {
+        mGasketDrawer.setColor(color);
+    }
+
+    public void setDrawable(Drawable drawable) {
+        mDrawable = drawable;
+        invalidate();
+    }
+
+    static class GasketDrawer {
+
+        private static final int SHADOW_RADIOUS = UiUtils.dp2pix(3);
+        private static final int SHADOW_OFFSET_Y = UiUtils.dp2pix(1);
+        private static final int GASKET_PADDING = SHADOW_RADIOUS + SHADOW_OFFSET_Y; // 4dp
+        private static final int SHADOW_COLOR = 0x8a000000;
+
+        private View mView;
+
+        private int mColor;
+        private int mDarkerColor;
+        private Paint mPaint;
+
+        private RectF mBounds;
+
+        private boolean mIsDark;
+
+        private GasketDrawer(View view, int color) {
+            mView = view;
+            mBounds = new RectF();
+            mColor = color;
+            mDarkerColor = UiUtils.getDarkerColor(color);
+            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
+            mPaint.setColor(mColor);
+            mPaint.setStyle(Paint.Style.FILL);
+
+            mPaint.setShadowLayer(SHADOW_RADIOUS, 0, SHADOW_OFFSET_Y, SHADOW_COLOR);
+            ViewUtils.removeHardwareAccelerationSupport(mView);
+        }
+
+        protected void onStateChange(int[] stateSet) {
+            boolean enabled = false;
+            boolean pressed = false;
+            boolean focused = false;
+
+            for (int state : stateSet) {
+                if (state == android.R.attr.state_enabled) {
+                    enabled = true;
+                }
+                if (state == android.R.attr.state_focused) {
+                    focused = true;
+                }
+                if (state == android.R.attr.state_pressed) {
+                    pressed = true;
+                }
+            }
+
+            setDark(!enabled || pressed || focused);
+        }
+
+        private void setDark(boolean isDark) {
+            if (mIsDark != isDark) {
+                mIsDark = isDark;
+                updateColor();
+            }
+        }
+
+        private void updateColor() {
+            mPaint.setColor(mIsDark ? mDarkerColor : mColor);
+            invalidateSelf();
+        }
+
+        private void invalidateSelf() {
+            mView.invalidate();
+        }
+
+        public void draw(Canvas canvas) {
+            mBounds.left = GASKET_PADDING;
+            mBounds.top = GASKET_PADDING;
+            mBounds.right = mView.getWidth() - GASKET_PADDING;
+            mBounds.bottom = mView.getHeight() - GASKET_PADDING;
+            canvas.drawOval(mBounds, mPaint);
+        }
+
+        public void setColor(int color) {
+            mColor = color;
+            mDarkerColor = UiUtils.getDarkerColor(color);
+            updateColor();
+        }
+    }
+}

app/src/main/res/values/styles.xml

@@ -15,4 +15,15 @@
   -->
 <resources>
 
+    <!-- FloatingActionButton -->
+    <style name="FloatingActionButton">
+        <item name="android:minWidth">60dp</item>
+        <item name="android:minHeight">60dp</item>
+    </style>
+
+    <style name="FloatingActionButton.Small">
+        <item name="android:minWidth">44dp</item>
+        <item name="android:minHeight">44dp</item>
+    </style>
+
 </resources>