1 files changed, 138 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/AspectRatioImageView.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/AspectRatioImageView.java
new file mode 100644
index 000000000..0df5ba5e8
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/AspectRatioImageView.java
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui.widget;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+import android.widget.ImageView;
+
+import org.sufficientlysecure.keychain.R;
+
+/**
+ * Maintains an aspect ratio based on either width or height. Disabled by default.
+ *
+ * from https://gist.github.com/JakeWharton/2856179
+ */
+public class AspectRatioImageView extends ImageView {
+    // NOTE: These must be kept in sync with the AspectRatioImageView attributes in attrs.xml.
+    public static final int MEASUREMENT_WIDTH = 0;
+    public static final int MEASUREMENT_HEIGHT = 1;
+
+    private static final float DEFAULT_ASPECT_RATIO = 1f;
+    private static final boolean DEFAULT_ASPECT_RATIO_ENABLED = false;
+    private static final int DEFAULT_DOMINANT_MEASUREMENT = MEASUREMENT_WIDTH;
+
+    private float aspectRatio;
+    private boolean aspectRatioEnabled;
+    private int dominantMeasurement;
+
+    public AspectRatioImageView(Context context) {
+        this(context, null);
+    }
+
+    public AspectRatioImageView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AspectRatioImageView);
+        aspectRatio = a.getFloat(R.styleable.AspectRatioImageView_aspectRatio, DEFAULT_ASPECT_RATIO);
+        aspectRatioEnabled = a.getBoolean(R.styleable.AspectRatioImageView_aspectRatioEnabled,
+                DEFAULT_ASPECT_RATIO_ENABLED);
+        dominantMeasurement = a.getInt(R.styleable.AspectRatioImageView_dominantMeasurement,
+                DEFAULT_DOMINANT_MEASUREMENT);
+        a.recycle();
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        if (!aspectRatioEnabled) return;
+
+        int newWidth;
+        int newHeight;
+        switch (dominantMeasurement) {
+            case MEASUREMENT_WIDTH:
+                newWidth = getMeasuredWidth();
+                newHeight = (int) (newWidth * aspectRatio);
+                break;
+
+            case MEASUREMENT_HEIGHT:
+                newHeight = getMeasuredHeight();
+                newWidth = (int) (newHeight * aspectRatio);
+                break;
+
+            default:
+                throw new IllegalStateException("Unknown measurement with ID " + dominantMeasurement);
+        }
+
+        setMeasuredDimension(newWidth, newHeight);
+    }
+
+    /**
+     * Get the aspect ratio for this image view.
+     */
+    public float getAspectRatio() {
+        return aspectRatio;
+    }
+
+    /**
+     * Set the aspect ratio for this image view. This will update the view instantly.
+     */
+    public void setAspectRatio(float aspectRatio) {
+        this.aspectRatio = aspectRatio;
+        if (aspectRatioEnabled) {
+            requestLayout();
+        }
+    }
+
+    /**
+     * Get whether or not forcing the aspect ratio is enabled.
+     */
+    public boolean getAspectRatioEnabled() {
+        return aspectRatioEnabled;
+    }
+
+    /**
+     * set whether or not forcing the aspect ratio is enabled. This will re-layout the view.
+     */
+    public void setAspectRatioEnabled(boolean aspectRatioEnabled) {
+        this.aspectRatioEnabled = aspectRatioEnabled;
+        requestLayout();
+    }
+
+    /**
+     * Get the dominant measurement for the aspect ratio.
+     */
+    public int getDominantMeasurement() {
+        return dominantMeasurement;
+    }
+
+    /**
+     * Set the dominant measurement for the aspect ratio.
+     *
+     * @see #MEASUREMENT_WIDTH
+     * @see #MEASUREMENT_HEIGHT
+     */
+    public void setDominantMeasurement(int dominantMeasurement) {
+        if (dominantMeasurement != MEASUREMENT_HEIGHT && dominantMeasurement != MEASUREMENT_WIDTH) {
+            throw new IllegalArgumentException("Invalid measurement type.");
+        }
+        this.dominantMeasurement = dominantMeasurement;
+        requestLayout();
+    }
+}
+\ No newline at end of file