// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.content.browser.input;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;
import com.google.common.annotations.VisibleForTesting;
import org.chromium.content.browser.PositionObserver;
/**
* CursorController for inserting text at the cursor position.
*/
public abstract class InsertionHandleController implements CursorController {
/** The handle view, lazily created when first shown */
private HandleView mHandle;
/** The view over which the insertion handle should be shown */
private final View mParent;
/** True iff the insertion handle is currently showing */
private boolean mIsShowing;
/** True iff the insertion handle can be shown automatically when selection changes */
private boolean mAllowAutomaticShowing;
private final Context mContext;
private final PositionObserver mPositionObserver;
public InsertionHandleController(View parent, PositionObserver positionObserver) {
mParent = parent;
mContext = parent.getContext();
mPositionObserver = positionObserver;
}
/** Allows the handle to be shown automatically when cursor position changes */
public void allowAutomaticShowing() {
mAllowAutomaticShowing = true;
}
/** Disallows the handle from being shown automatically when cursor position changes */
public void hideAndDisallowAutomaticShowing() {
hide();
mAllowAutomaticShowing = false;
}
/**
* Shows the handle.
*/
public void showHandle() {
createHandleIfNeeded();
showHandleIfNeeded();
}
void showPastePopup() {
if (mIsShowing) {
mHandle.showPastePopupWindow();
}
}
public void showHandleWithPastePopup() {
showHandle();
showPastePopup();
}
/**
* @return whether the handle is being dragged.
*/
public boolean isDragging() {
return mHandle != null && mHandle.isDragging();
}
/** Shows the handle at the given coordinates, as long as automatic showing is allowed */
public void onCursorPositionChanged() {
if (mAllowAutomaticShowing) {
showHandle();
}
}
/**
* Moves the handle so that it points at the given coordinates.
* @param x Handle x in physical pixels.
* @param y Handle y in physical pixels.
*/
public void setHandlePosition(float x, float y) {
mHandle.positionAt((int) x, (int) y);
}
/**
* If the handle is not visible, sets its visibility to View.VISIBLE and begins fading it in.
*/
public void beginHandleFadeIn() {
mHandle.beginFadeIn();
}
/**
* Sets the handle to the given visibility.
*/
public void setHandleVisibility(int visibility) {
mHandle.setVisibility(visibility);
}
int getHandleX() {
return mHandle.getAdjustedPositionX();
}
int getHandleY() {
return mHandle.getAdjustedPositionY();
}
@VisibleForTesting
public HandleView getHandleViewForTest() {
return mHandle;
}
@Override
public void onTouchModeChanged(boolean isInTouchMode) {
if (!isInTouchMode) {
hide();
}
}
@Override
public void hide() {
if (mIsShowing) {
if (mHandle != null) mHandle.hide();
mIsShowing = false;
}
}
@Override
public boolean isShowing() {
return mIsShowing;
}
@Override
public void beforeStartUpdatingPosition(HandleView handle) {}
@Override
public void updatePosition(HandleView handle, int x, int y) {
setCursorPosition(x, y);
}
/**
* The concrete implementation must cause the cursor position to move to the given
* coordinates and (possibly asynchronously) set the insertion handle position
* after the cursor position change is made via setHandlePosition.
* @param x
* @param y
*/
protected abstract void setCursorPosition(int x, int y);
/** Pastes the contents of clipboard at the current insertion point */
protected abstract void paste();
/** Returns the current line height in pixels */
protected abstract int getLineHeight();
@Override
public void onDetached() {}
boolean canPaste() {
return ((ClipboardManager) mContext.getSystemService(
Context.CLIPBOARD_SERVICE)).hasPrimaryClip();
}
private void createHandleIfNeeded() {
if (mHandle == null) {
mHandle = new HandleView(this, HandleView.CENTER, mParent, mPositionObserver);
}
}
private void showHandleIfNeeded() {
if (!mIsShowing) {
mIsShowing = true;
mHandle.show();
setHandleVisibility(HandleView.VISIBLE);
}
}
/*
* This class is based on TextView.PastePopupMenu.
*/
class PastePopupMenu implements OnClickListener {
private final PopupWindow mContainer;
private int mPositionX;
private int mPositionY;
private final View[] mPasteViews;
private final int[] mPasteViewLayouts;
public PastePopupMenu() {
mContainer = new PopupWindow(mContext, null,
android.R.attr.textSelectHandleWindowStyle);
mContainer.setSplitTouchEnabled(true);
mContainer.setClippingEnabled(false);
mContainer.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
mContainer.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
final int[] POPUP_LAYOUT_ATTRS = {
android.R.attr.textEditPasteWindowLayout,
android.R.attr.textEditNoPasteWindowLayout,
android.R.attr.textEditSidePasteWindowLayout,
android.R.attr.textEditSideNoPasteWindowLayout,
};
mPasteViews = new View[POPUP_LAYOUT_ATTRS.length];
mPasteViewLayouts = new int[POPUP_LAYOUT_ATTRS.length];
TypedArray attrs = mContext.obtainStyledAttributes(POPUP_LAYOUT_ATTRS);
for (int i = 0; i < attrs.length(); ++i) {
mPasteViewLayouts[i] = attrs.getResourceId(attrs.getIndex(i), 0);
}
attrs.recycle();
}
private int viewIndex(boolean onTop) {
return (onTop ? 0 : 1 << 1) + (canPaste() ? 0 : 1 << 0);
}
private void updateContent(boolean onTop) {
final int viewIndex = viewIndex(onTop);
View view = mPasteViews[viewIndex];
if (view == null) {
final int layout = mPasteViewLayouts[viewIndex];
LayoutInflater inflater = (LayoutInflater) mContext.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (inflater != null) {
view = inflater.inflate(layout, null);
}
if (view == null) {
throw new IllegalArgumentException("Unable to inflate TextEdit paste window");
}
final int size = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
view.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
view.measure(size, size);
view.setOnClickListener(this);
mPasteViews[viewIndex] = view;
}
mContainer.setContentView(view);
}
void show() {
updateContent(true);
positionAtCursor();
}
void hide() {
mContainer.dismiss();
}
boolean isShowing() {
return mContainer.isShowing();
}
@Override
public void onClick(View v) {
if (canPaste()) {
paste();
}
hide();
}
void positionAtCursor() {
View contentView = mContainer.getContentView();
int width = contentView.getMeasuredWidth();
int height = contentView.getMeasuredHeight();
int lineHeight = getLineHeight();
mPositionX = (int) (mHandle.getAdjustedPositionX() - width / 2.0f);
mPositionY = mHandle.getAdjustedPositionY() - height - lineHeight;
final int[] coords = new int[2];
mParent.getLocationInWindow(coords);
coords[0] += mPositionX;
coords[1] += mPositionY;
final int screenWidth = mContext.getResources().getDisplayMetrics().widthPixels;
if (coords[1] < 0) {
updateContent(false);
// Update dimensions from new view
contentView = mContainer.getContentView();
width = contentView.getMeasuredWidth();
height = contentView.getMeasuredHeight();
// Vertical clipping, move under edited line and to the side of insertion cursor
// TODO bottom clipping in case there is no system bar
coords[1] += height;
coords[1] += lineHeight;
// Move to right hand side of insertion cursor by default. TODO RTL text.
final Drawable handle = mHandle.getDrawable();
final int handleHalfWidth = handle.getIntrinsicWidth() / 2;
if (mHandle.getAdjustedPositionX() + width < screenWidth) {
coords[0] += handleHalfWidth + width / 2;
} else {
coords[0] -= handleHalfWidth + width / 2;
}
} else {
// Horizontal clipping
coords[0] = Math.max(0, coords[0]);
coords[0] = Math.min(screenWidth - width, coords[0]);
}
mContainer.showAtLocation(mParent, Gravity.NO_GRAVITY, coords[0], coords[1]);
}
}
}