android: show text cursor in place suggested by invalid. event

Text cursor is a simple line (currently implemented as a drawable
and streched), which height is adaptable. It is drawn in a different
layer than the document.

Change-Id: I40509a866e3a3173e3efcb88e73066565a1619ae

6 files changed, 184 insertions, 0 deletions

diff --git a/android/experimental/LOAndroid3/res/drawable/text_cursor.xml b/android/experimental/LOAndroid3/res/drawable/text_cursor.xml
new file mode 100644
index 000000000000..f39e6e8a6d1f
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable/text_cursor.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
+    <size android:width="2px" />
+    <size android:height="1px" />
+    <solid android:color="#000000"/>
+</shape>
\ No newline at end of file
diff --git a/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml b/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml
index c876b288bc3d..8d8d0148bb0b 100644
--- a/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml
+++ b/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml
@@ -26,4 +26,11 @@
                                            android:src="@drawable/handle_end_level"
                                            android:visibility="gone"
                                            gecko:handleType="end"/>
+
+    <org.libreoffice.TextCursorView android:id="@+id/text_cursor_view"
+                                    android:layout_width="wrap_content"
+                                    android:layout_height="wrap_content"
+                                    android:src="@drawable/text_cursor"
+                                    android:visibility="gone"/>
+
 </merge>
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
index 48868f9b2e57..60c3e9ce8df7 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
@@ -395,6 +395,10 @@ public class LOKitTileProvider implements TileProvider, Document.MessageCallback
                     TextSelection textSelection = LibreOfficeMainActivity.mAppContext.getTextSelection();
                     textSelection.positionHandle(TextSelectionHandle.HandleType.MIDDLE, underSelection);
                     textSelection.showHandle(TextSelectionHandle.HandleType.MIDDLE);
+
+                    TextCursorLayer textCursorLayer = LibreOfficeMainActivity.mAppContext.getTextCursorLayer();
+                    textCursorLayer.positionCursor(rect);
+                    textCursorLayer.showCursor();
                 }
                 break;
             }
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
index 42ffac8f4a8b..56e388968e77 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
@@ -48,6 +48,7 @@ public class LibreOfficeMainActivity extends LOAbout {
     private DocumentPartViewListAdapter mDocumentPartViewListAdapter;
     private String mInputFile;
     private TextSelection mTextSelection;
+    private TextCursorLayer mTextCursorLayer;
 
     public LibreOfficeMainActivity() {
         super(/*newActivity=*/false);
@@ -126,6 +127,7 @@ public class LibreOfficeMainActivity extends LOAbout {
         }
 
         mTextSelection = new TextSelection(mAppContext);
+        mTextCursorLayer = new TextCursorLayer(mAppContext);
 
         mLayerClient = new GeckoLayerClient(this);
         mLayerClient.setZoomConstraints(new ZoomConstraints(true));
@@ -238,6 +240,10 @@ public class LibreOfficeMainActivity extends LOAbout {
         return mTextSelection;
     }
 
+    public TextCursorLayer getTextCursorLayer() {
+        return mTextCursorLayer;
+    }
+
     private class DocumentPartClickListener implements android.widget.AdapterView.OnItemClickListener {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/TextCursorLayer.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/TextCursorLayer.java
new file mode 100644
index 000000000000..e83a56c30f8d
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/TextCursorLayer.java
@@ -0,0 +1,82 @@
+package org.libreoffice;
+
+import android.app.Activity;
+import android.graphics.RectF;
+import android.util.Log;
+import android.view.View;
+
+import org.mozilla.gecko.TextSelectionHandle;
+import org.mozilla.gecko.gfx.Layer;
+import org.mozilla.gecko.gfx.LayerView;
+import org.mozilla.gecko.util.FloatUtils;
+
+/**
+ * The TextCursorLayer is a layer which is responsible for showing the cursor and
+ * controls its position, height and visibility.
+ */
+public class TextCursorLayer extends Layer {
+    private static final String LOGTAG = TextCursorLayer.class.getSimpleName();
+
+    private final TextCursorView mCursorView;
+    private float mViewLeft;
+    private float mViewTop;
+    private float mViewZoom;
+
+    public TextCursorLayer(Activity context) {
+        mCursorView = (TextCursorView) context.findViewById(R.id.text_cursor_view);
+        if (mCursorView == null) {
+            Log.e(LOGTAG, "Failed to initialize TextCursorLayer - CursorView is null");
+        }
+    }
+
+    @Override
+    public void draw(final RenderContext context) {
+        if (FloatUtils.fuzzyEquals(mViewLeft, context.viewport.left)
+                && FloatUtils.fuzzyEquals(mViewTop, context.viewport.top)
+                && FloatUtils.fuzzyEquals(mViewZoom, context.zoomFactor)) {
+            return;
+        }
+
+        mViewLeft = context.viewport.left;
+        mViewTop = context.viewport.top;
+        mViewZoom = context.zoomFactor;
+
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                mCursorView.repositionWithViewport(context.viewport.left, context.viewport.top, context.zoomFactor);
+            }
+        });
+    }
+
+    public void showCursor() {
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                mCursorView.setVisibility(View.VISIBLE);
+
+                mViewLeft = 0.0f;
+                mViewTop = 0.0f;
+                mViewZoom = 0.0f;
+                LayerView layerView = LOKitShell.getLayerView();
+                if (layerView != null) {
+                    layerView.addLayer(TextCursorLayer.this);
+                }
+            }
+        });
+    }
+
+    public void hideCursor() {
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                mCursorView.setVisibility(View.GONE);
+            }
+        });
+    }
+
+    public void positionCursor(final RectF position) {
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                mCursorView.changePosition(position);
+            }
+        });
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/TextCursorView.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/TextCursorView.java
new file mode 100644
index 000000000000..d9e51fcedb93
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/TextCursorView.java
@@ -0,0 +1,79 @@
+package org.libreoffice;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.PointF;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.RelativeLayout;
+
+import org.mozilla.gecko.gfx.ImmutableViewportMetrics;
+import org.mozilla.gecko.gfx.LayerView;
+import org.mozilla.gecko.gfx.RectUtils;
+
+/**
+ * Text cursor view responsible to show the cursor drawable on the screen.
+ */
+public class TextCursorView extends ImageView {
+    private static final String LOGTAG = TextCursorView.class.getSimpleName();
+
+    private RectF mPosition;
+    private RelativeLayout.LayoutParams mLayoutParams;
+
+    private int mLeft;
+    private int mTop;
+
+    private int mWidth;
+    private int mHeight;
+
+    public TextCursorView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public void changePosition(RectF position) {
+        LayerView layerView = LOKitShell.getLayerView();
+        if (layerView == null) {
+            Log.e(LOGTAG, "Can't position handle because layerView is null");
+            return;
+        }
+
+        mPosition = position;
+
+        mWidth = Math.round(position.width());
+        mHeight = Math.round(position.height());
+
+        ImmutableViewportMetrics metrics = layerView.getViewportMetrics();
+        repositionWithViewport(metrics.viewportRectLeft, metrics.viewportRectTop, metrics.zoomFactor);
+    }
+
+    public void repositionWithViewport(float x, float y, float zoom) {
+        RectF scaled = RectUtils.scale(mPosition, zoom);
+
+        mLeft = Math.round(scaled.centerX() - x);
+        mTop = Math.round(scaled.centerY() - y);
+
+        setScaleY(scaled.height());
+
+        setLayoutPosition();
+    }
+
+    private void setLayoutPosition() {
+        if (mLayoutParams == null) {
+            mLayoutParams = (RelativeLayout.LayoutParams) getLayoutParams();
+            // Set negative right/bottom margins so that the handles can be dragged outside of
+            // the content area (if they are dragged to the left/top, the dyanmic margins set
+            // below will take care of that).
+            mLayoutParams.rightMargin = 0 - mWidth;
+            mLayoutParams.bottomMargin = 0 - mHeight;
+        }
+
+        mLayoutParams.leftMargin = mLeft;
+        mLayoutParams.topMargin = mTop;
+
+        setLayoutParams(mLayoutParams);
+    }
+}
\ No newline at end of file