org.solovyev.android.keyboard.AKeyboardButtonPreview Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of android-common-samples Show documentation
There is a newer version: 1.1.18
Show newest version
/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android.keyboard;

import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.TextView;
import org.solovyev.android.Views;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * User: serso
 * Date: 11/5/12
 * Time: 2:08 PM
 */
public class AKeyboardButtonPreview {

	private static final String TAG = AKeyboardButtonPreview.class.getSimpleName();

	private static final int MSG_SHOW_PREVIEW = 1;
	private static final int MSG_REMOVE_PREVIEW = 2;

	private static final long DELAY_AFTER_PREVIEW = 200;
	private static final long DELAY_BEFORE_PREVIEW = 0;

	@Nonnull
	private PopupWindow popup;

	@Nonnull
	private final View popupParent;

	private View previewView;

	@Nonnull
	private final Handler handler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {
				case MSG_SHOW_PREVIEW:
					Log.d(TAG, "Show preview for " + msg.obj);
					showText0((PreviewParams) msg.obj);
					break;
				case MSG_REMOVE_PREVIEW:
					Log.d(TAG, "Hide preview for " + msg.obj);
					hide();
					break;
			}
		}
	};

	public AKeyboardButtonPreview(@Nonnull View popupParent) {
		this.popupParent = popupParent;
	}

	public void createPreviewView(@Nonnull LayoutInflater layoutInflater) {
		Log.d(TAG, "Creating preview view and popup window...");

		previewView = layoutInflater.inflate(R.layout.drag_keyboard_preview, null);
		previewView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
		popup = new PopupWindow(previewView);
	}

	public void showPreview(@Nonnull View view, @Nullable CharSequence text, @Nullable Integer drawableResId) {
		final int[] location = new int[2];
		view.getLocationInWindow(location);
		int x = location[0] + view.getWidth() / 2;
		int y = location[1];

		final PreviewParams previewParams;
		if (text == null) {
			if (drawableResId != null) {
				previewParams = PreviewParams.newDrawableInstance(x, y, drawableResId);
			} else {
				previewParams = PreviewParams.newTextInstance(x, y, "");
				Log.e(AKeyboardButtonPreview.class.getSimpleName(), "For view: " + view + " neither text nor drawable resource is specified!");
			}
		} else {
			previewParams = PreviewParams.newTextInstance(x, y, text.toString());
		}

		synchronized (handler) {
			// remove all 'remove' runnable for current params
			handler.removeMessages(MSG_REMOVE_PREVIEW, previewParams);
			handler.removeMessages(MSG_SHOW_PREVIEW, previewParams);

			handler.sendMessageDelayed(handler.obtainMessage(MSG_SHOW_PREVIEW, previewParams), DELAY_BEFORE_PREVIEW);
		}
	}

	private void showText0(@Nonnull PreviewParams previewParams) {
		synchronized (handler) {
			handler.removeMessages(MSG_REMOVE_PREVIEW, previewParams);
		}

		final PopupWindow popup = this.popup;

		boolean image = false;

		final TextView previewTextView = (TextView) previewView.findViewById(R.id.preview_text_view);
		previewTextView.setText(previewParams.getText());

		final Integer drawableResId = previewParams.getDrawableResId();
		final ImageView previewImageView = (ImageView) previewView.findViewById(R.id.preview_image_view);
		if (drawableResId != null) {
			final Drawable drawable = previewView.getContext().getResources().getDrawable(drawableResId);
			previewImageView.setImageDrawable(drawable);
			if (drawable != null) {
				image = true;
			}
		} else {
			previewImageView.setImageDrawable(null);
		}

		if (image) {
			previewTextView.setVisibility(View.GONE);
			previewImageView.setVisibility(View.VISIBLE);
		} else {
			previewImageView.setVisibility(View.GONE);
			previewTextView.setVisibility(View.VISIBLE);
		}

		previewView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

		final int popupWidth = previewView.getMeasuredWidth();
		final int popupHeight = previewView.getMeasuredHeight();
		final int popupMargin = Views.toPixels(popupParent.getContext().getResources().getDisplayMetrics(), 10);

		int popupX = previewParams.getX() - popupWidth / 2;
		int popupY = previewParams.getY() - popupHeight - popupMargin;

		if (popup.isShowing()) {
			popup.update(popupX, popupY, popupWidth, popupHeight);
		} else {
			popup.setWidth(popupWidth);
			popup.setHeight(popupHeight);
			popup.showAtLocation(popupParent, Gravity.NO_GRAVITY, popupX, popupY);
		}

		previewView.setVisibility(View.VISIBLE);

		synchronized (handler) {
			handler.sendMessageDelayed(handler.obtainMessage(MSG_REMOVE_PREVIEW, previewParams), DELAY_AFTER_PREVIEW);
		}
	}

	public void hide() {
		if (previewView != null) {
			previewView.setVisibility(View.INVISIBLE);
		}
	}
}