Trebuchet: Draw the dynamic grid image dynamically

This commits makes it possible to draw the image which previews
the selected grid dynamically.

Change-Id: I7c029f06110afdf1fe62145a079bba76166bb690

7 files changed, 124 insertions, 108 deletions

diff --git a/res/drawable/grid.png b/res/drawable/grid.png
deleted file mode 100644
index 79fe901d1..000000000
--- a/res/drawable/grid.png
+++ /dev/null
diff --git a/res/drawable/grid_comfortable.png b/res/drawable/grid_comfortable.png
deleted file mode 100644
index 34e3ef2ee..000000000
--- a/res/drawable/grid_comfortable.png
+++ /dev/null
diff --git a/res/drawable/grid_condensed.png b/res/drawable/grid_condensed.png
deleted file mode 100644
index ebc9d4e54..000000000
--- a/res/drawable/grid_condensed.png
+++ /dev/null
diff --git a/res/drawable/grid_cozy.png b/res/drawable/grid_cozy.png
deleted file mode 100644
index 929bcb541..000000000
--- a/res/drawable/grid_cozy.png
+++ /dev/null
diff --git a/res/layout/dynamic_grid_size_screen.xml b/res/layout/dynamic_grid_size_screen.xml
index 38db4b05c..5109e73d8 100644
--- a/res/layout/dynamic_grid_size_screen.xml
+++ b/res/layout/dynamic_grid_size_screen.xml
@@ -34,12 +34,12 @@
             android:textSize="16sp" />
     </LinearLayout>
 
-    <ImageView
+    <view
+        class="com.android.launcher3.DynamicGridSizeFragment$GridSizeView"
         android:id="@+id/dynamic_grid_size_image"
         android:layout_width="@dimen/dynamic_grid_size_image_width"
         android:layout_height="@dimen/dynamic_grid_size_image_height"
         android:layout_gravity="center_horizontal"
-        android:adjustViewBounds="true"
         android:layout_marginBottom="@dimen/grid_padding"/>
 
     <ListView
diff --git a/res/values/colors.xml b/res/values/colors.xml
index 434cdf9e5..3ec8c73ba 100644
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -43,4 +43,7 @@
     <color name="settings_bg_header_color">#FFb2b0ab</color>
     <color name="settings_bg_selected_color">#26000000</color>
     <color name="settings_transition_selected_color">#50000000</color>
+
+    <color name="dynamic_grid_preview_background">#FFFFFFFF</color>
+    <color name="dynamic_grid_preview_foreground">#FF000000</color>
 </resources>
diff --git a/src/com/android/launcher3/DynamicGridSizeFragment.java b/src/com/android/launcher3/DynamicGridSizeFragment.java
index 490335ddf..9ab1ad0bd 100644
--- a/src/com/android/launcher3/DynamicGridSizeFragment.java
+++ b/src/com/android/launcher3/DynamicGridSizeFragment.java
@@ -1,6 +1,23 @@
+/*
+ * Copyright (C) 2014 The CyanogenMod Project
+ *
+ * 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
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * 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.android.launcher3;
 
 import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.app.Dialog;
 import android.app.Fragment;
@@ -8,12 +25,11 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
-import android.graphics.drawable.Drawable;
 import android.os.Bundle;
+import android.util.AttributeSet;
 import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -25,13 +41,18 @@ import android.widget.LinearLayout;
 import android.widget.ListView;
 import android.widget.NumberPicker;
 import android.widget.TextView;
+
 import com.android.launcher3.settings.SettingsProvider;
 
-public class DynamicGridSizeFragment extends Fragment implements NumberPicker.OnValueChangeListener, Dialog.OnDismissListener{
-    public static final String DYNAMIC_GRID_SIZE_FRAGMENT = "dynamicGridSizeFragment";
+public class DynamicGridSizeFragment extends Fragment
+        implements NumberPicker.OnValueChangeListener, Dialog.OnDismissListener {
+    public static final String DYNAMIC_GRID_SIZE_FRAGMENT = "DynamicGridSizeFragment";
+
     public static final int MIN_DYNAMIC_GRID_ROWS = 2;
     public static final int MIN_DYNAMIC_GRID_COLUMNS = 3;
-    ImageView mDynamicGridImage;
+
+    GridSizeView mDynamicGrid;
+
     ListView mListView;
     View mCurrentSelection;
     GridSizeArrayAdapter mAdapter;
@@ -43,11 +64,9 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
     int mCustomGridColumns = 0;
 
     View.OnClickListener mSettingsItemListener = new View.OnClickListener() {
-
         @Override
         public void onClick(View v) {
-            mCurrentSize = DeviceProfile.GridSize
-                    .getModeForValue((Integer) v.getTag());
+            mCurrentSize = DeviceProfile.GridSize.getModeForValue((Integer) v.getTag());
 
             setCleared(mCurrentSelection);
             setSelected(v);
@@ -60,16 +79,15 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
             ((GridSizeArrayAdapter) mListView.getAdapter()).notifyDataSetChanged();
 
             mAdapter.notifyDataSetInvalidated();
-            setCurrentImage();
+            updateGridMetrics();
         }
     };
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
-                             Bundle savedInstanceState) {
+                Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.dynamic_grid_size_screen, container, false);
-        mDynamicGridImage = (ImageView) v.findViewById(R.id.dynamic_grid_size_image);
-        mDynamicGridImage.setBackground(getResources().getDrawable(R.drawable.grid));
+        mDynamicGrid = (GridSizeView) v.findViewById(R.id.dynamic_grid_size_image);
 
         LinearLayout titleLayout = (LinearLayout) v.findViewById(R.id.dynamic_grid_title);
         titleLayout.setOnClickListener(new View.OnClickListener() {
@@ -83,11 +101,11 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
                 SettingsProvider.getIntCustomDefault(getActivity(),
                 SettingsProvider.SETTINGS_UI_DYNAMIC_GRID_SIZE, 0));
 
-        setCurrentImage();
+        updateGridMetrics();
 
         mListView = (ListView) v.findViewById(R.id.dynamic_grid_list);
         Resources res = getResources();
-        String [] values = {
+        String[] values = {
                 res.getString(R.string.grid_size_comfortable),
                 res.getString(R.string.grid_size_cozy),
                 res.getString(R.string.grid_size_condensed),
@@ -99,64 +117,16 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
         return v;
     }
 
-    private void setCurrentImage() {
-        Drawable d = null;
-        boolean custom = false;
-
-        switch (mCurrentSize) {
-            case Comfortable:
-                d = getResources().getDrawable(R.drawable.grid_comfortable);
-                break;
-            case Cozy:
-                d = getResources().getDrawable(R.drawable.grid_cozy);
-                break;
-            case Condensed:
-                d = getResources().getDrawable(R.drawable.grid_condensed);
-                break;
-            default:
-
-                custom = true;
-                break;
-        }
-
-        if (d != null && !custom) {
-            mDynamicGridImage.setImageBitmap(null);
-            mDynamicGridImage.setBackground(d);
-        } else if (custom) {
-            mDynamicGridImage.setBackground(null);
-            mDynamicGridImage.setImageBitmap(writeOnDrawable(R.drawable.grid));
+    private void updateGridMetrics() {
+        if (mCurrentSize == DeviceProfile.GridSize.Custom) {
+            mDynamicGrid.setMetrics(mCustomGridRows, mCustomGridColumns);
+        } else {
+            DeviceProfile grid = getGrid();
+            mDynamicGrid.setMetrics(grid.numRowsBase + mCurrentSize.getValue(),
+                    grid.numColumnsBase + mCurrentSize.getValue());
         }
     }
 
-    public Bitmap writeOnDrawable(int drawableId){
-        LauncherAppState app = LauncherAppState.getInstance();
-        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
-
-        int rows = mCustomGridRows == 0 ? (int) grid.numRows : mCustomGridRows;
-        int columns = mCustomGridColumns == 0 ? (int) grid.numColumns : mCustomGridColumns;
-
-        String text = rows + " " + "\u00d7" + " " + columns;
-
-        Bitmap bm = BitmapFactory.decodeResource(getResources(),
-                drawableId).copy(Bitmap.Config.ARGB_8888, true);
-
-        Paint paint = new Paint();
-        paint.setStyle(Paint.Style.FILL);
-        paint.setColor(Color.BLACK);
-        int px = getResources().getDimensionPixelOffset(R.dimen.grid_custom_text);
-        paint.setTextSize(px);
-
-        Canvas canvas = new Canvas(bm);
-
-        float canvasWidth = canvas.getWidth();
-        float sentenceWidth = paint.measureText(text);
-        float startPositionX = (canvasWidth - sentenceWidth) / 2;
-
-        canvas.drawText(text, startPositionX, bm.getHeight()/2, paint);
-
-        return bm;
-    }
-
     @Override
     public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
         if (enter) {
@@ -167,21 +137,14 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
 
             final View darkPanel = ((Launcher) getActivity()).getDarkPanel();
             darkPanel.setVisibility(View.VISIBLE);
-            ObjectAnimator anim2 = ObjectAnimator.ofFloat(
-                    darkPanel , "alpha", 0.0f, 0.3f);
+            ObjectAnimator anim2 = ObjectAnimator.ofFloat(darkPanel, "alpha", 0.0f, 0.3f);
             anim2.start();
 
-            anim.addListener(new Animator.AnimatorListener() {
-                @Override
-                public void onAnimationStart(Animator arg0) {}
+            anim.addListener(new AnimatorListenerAdapter() {
                 @Override
-                public void onAnimationRepeat(Animator arg0) {}
-                @Override
-                public void onAnimationEnd(Animator arg0) {
+                public void onAnimationEnd (Animator animation) {
                     darkPanel.setVisibility(View.GONE);
                 }
-                @Override
-                public void onAnimationCancel(Animator arg0) {}
             });
 
             return anim;
@@ -208,23 +171,23 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
 
     private void showNumberPicker() {
         mDialog = new Dialog(getActivity());
-        mDialog.setTitle(getResources().getString(R.string.preferences_interface_homescreen_custom));
+        mDialog.setTitle(getResources().getString(
+                R.string.preferences_interface_homescreen_custom));
         mDialog.setContentView(R.layout.custom_grid_size_dialog);
 
-        NumberPicker nPRows= (NumberPicker) mDialog.findViewById(R.id.custom_rows);
+        NumberPicker nPRows = (NumberPicker) mDialog.findViewById(R.id.custom_rows);
         NumberPicker nPColumns = (NumberPicker) mDialog.findViewById(R.id.custom_columns);
 
-        LauncherAppState app = LauncherAppState.getInstance();
-        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
-
+        DeviceProfile grid = getGrid();
         int rows = grid.numRowsBase;
         int columns = grid.numColumnsBase;
-        if (mCustomGridColumns == 0) {
-            mCustomGridColumns = (int) grid.numColumns;
-        }
+
         if (mCustomGridRows == 0) {
             mCustomGridRows = (int) grid.numRows;
         }
+        if (mCustomGridColumns == 0) {
+            mCustomGridColumns = (int) grid.numColumns;
+        }
 
         nPRows.setMinValue(Math.max(MIN_DYNAMIC_GRID_ROWS, rows - DeviceProfile.GRID_SIZE_MIN));
         nPRows.setMaxValue(rows + DeviceProfile.GRID_SIZE_MAX);
@@ -233,15 +196,16 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
         nPRows.setOnValueChangedListener(this);
         nPRows.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
 
-        nPColumns.setMinValue(Math.max(MIN_DYNAMIC_GRID_COLUMNS, columns - DeviceProfile.GRID_SIZE_MIN));
+        nPColumns.setMinValue(Math.max(MIN_DYNAMIC_GRID_COLUMNS,
+                columns - DeviceProfile.GRID_SIZE_MIN));
         nPColumns.setMaxValue(columns + DeviceProfile.GRID_SIZE_MAX);
         nPColumns.setValue(mCustomGridColumns);
         nPColumns.setWrapSelectorWheel(false);
         nPColumns.setOnValueChangedListener(this);
         nPColumns.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
 
-        Button b = (Button) mDialog.findViewById(R.id.dialog_confirm_button);
-        b.setOnClickListener(new View.OnClickListener() {
+        Button button = (Button) mDialog.findViewById(R.id.dialog_confirm_button);
+        button.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 if (mDialog != null) {
@@ -249,6 +213,7 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
                 }
             }
         });
+
         mDialog.setOnDismissListener(this);
         mDialog.show();
     }
@@ -278,16 +243,14 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
                 SettingsProvider.SETTINGS_UI_HOMESCREEN_COLUMNS, mCustomGridColumns);
 
         mAdapter.notifyDataSetInvalidated();
-
-        setCurrentImage();
+        mDynamicGrid.setMetrics(mCustomGridRows, mCustomGridColumns);
     }
 
     private class GridSizeArrayAdapter extends ArrayAdapter<String> {
         Context mContext;
         String[] mTitles;
 
-        public GridSizeArrayAdapter(Context context, int textViewResourceId,
-                                       String[] objects) {
+        public GridSizeArrayAdapter(Context context, int textViewResourceId, String[] objects) {
             super(context, textViewResourceId, objects);
 
             mContext = context;
@@ -296,27 +259,29 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
 
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
-            LayoutInflater inflater = (LayoutInflater) mContext
-                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
-            convertView = inflater.inflate(R.layout.settings_pane_list_item,
-                    parent, false);
-            TextView textView = (TextView) convertView
-                    .findViewById(R.id.item_name);
+            if (convertView == null) {
+                LayoutInflater inflater = (LayoutInflater)
+                    mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                convertView = inflater.inflate(R.layout.settings_pane_list_item, parent, false);
+            }
+
+            TextView textView = (TextView) convertView.findViewById(R.id.item_name);
             textView.setText(mTitles[position]);
-            // Set Selected State
+
+            // Set selected state
             if (position == mCurrentSize.getValue()) {
+                if (mCurrentSelection != null) {
+                    setCleared(mCurrentSelection);
+                }
                 mCurrentSelection = convertView;
                 setSelected(mCurrentSelection);
             }
 
             if (position == DeviceProfile.GridSize.Custom.getValue()) {
-                LauncherAppState app = LauncherAppState.getInstance();
-                DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
-
                 int rows = SettingsProvider.getIntCustomDefault(getActivity(),
-                        SettingsProvider.SETTINGS_UI_HOMESCREEN_ROWS, grid.numRowsBase);
+                        SettingsProvider.SETTINGS_UI_HOMESCREEN_ROWS, getGrid().numRowsBase);
                 int columns = SettingsProvider.getIntCustomDefault(getActivity(),
-                        SettingsProvider.SETTINGS_UI_HOMESCREEN_COLUMNS, grid.numColumnsBase);
+                        SettingsProvider.SETTINGS_UI_HOMESCREEN_COLUMNS, getGrid().numColumnsBase);
                 String gridSize = rows + " " + "\u00d7" + " " + columns;
 
                 textView.setText(getString(R.string.grid_size_custom_and_size, gridSize));
@@ -327,4 +292,52 @@ public class DynamicGridSizeFragment extends Fragment implements NumberPicker.On
             return convertView;
         }
     }
+
+    private DeviceProfile getGrid() {
+        LauncherAppState app = LauncherAppState.getInstance();
+        return app.getDynamicGrid().getDeviceProfile();
+    }
+
+    private static class GridSizeView extends View {
+        private int mRows = 0, mColumns = 0;
+        private Paint mForegroundPaint;
+        private int mBackgroundColor;
+
+        public GridSizeView(Context context, AttributeSet attrs) {
+            super(context, attrs);
+            Resources res = context.getResources();
+
+            mForegroundPaint = new Paint();
+            mForegroundPaint.setColor(res.getColor(R.color.dynamic_grid_preview_foreground));
+            mBackgroundColor = res.getColor(R.color.dynamic_grid_preview_background);
+        }
+
+        public void setMetrics(int rows, int columns) {
+            mRows = rows;
+            mColumns = columns;
+            invalidate();
+        }
+
+        @Override
+        protected void onDraw(Canvas canvas) {
+            float width = getWidth() - getPaddingLeft() - getPaddingRight();
+            float height = getHeight() - getPaddingTop() - getPaddingBottom();
+            float xOffset = getPaddingLeft();
+            float yOffset = getPaddingTop();
+
+            canvas.drawColor(mBackgroundColor);
+
+            // Draw rows
+            for (int i = 1; i < mRows; i++) {
+                float yPos = yOffset + height / mRows * i;
+                canvas.drawLine(xOffset, yPos, xOffset + width, yPos, mForegroundPaint);
+            }
+
+            // Draw columns
+            for (int j = 1; j < mColumns; j++) {
+                float xPos = xOffset + width / mColumns * j;
+                canvas.drawLine(xPos, yOffset, xPos, yOffset + height, mForegroundPaint);
+            }
+        }
+    }
 }