/*
* 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: se.solovyev@gmail.com
* Site: http://se.solovyev.org
*/
package org.solovyev.android.calculator;
import android.content.Context;
import android.content.res.Resources;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import android.text.method.ScrollingMovementMethod;
import android.util.AttributeSet;
import org.solovyev.android.Check;
import org.solovyev.android.calculator.view.TextHighlighter;
import org.solovyev.android.views.AutoResizeTextView;
import javax.annotation.Nonnull;
import static android.util.TypedValue.COMPLEX_UNIT_SP;
import static android.util.TypedValue.applyDimension;
public class DisplayView extends AutoResizeTextView {
@Nullable
private Engine engine;
@Nullable
private TextHighlighter textHighlighter;
@Nonnull
private DisplayState state = DisplayState.empty();
public DisplayView(Context context) {
super(context);
init(context);
}
public DisplayView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public DisplayView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
@Nullable
private TextHighlighter getTextHighlighter() {
if (textHighlighter == null && engine != null) {
textHighlighter = new TextHighlighter(getTextColors().getDefaultColor(), false, engine);
}
return textHighlighter;
}
private void init(@Nonnull Context context) {
final Resources resources = getResources();
setAddEllipsis(false);
setMinTextSize(applyDimension(COMPLEX_UNIT_SP, 10, resources.getDisplayMetrics()));
// make text scrollable if it doesn't fit
setMovementMethod(ScrollingMovementMethod.getInstance());
}
@Nonnull
private Preferences.Gui.TextColor getTextColor() {
final Context context = getContext();
return App.getThemeFor(context).getTextColorFor(context);
}
@Nonnull
public DisplayState getState() {
Check.isMainThread();
return state;
}
public void setState(@Nonnull final DisplayState newState) {
Check.isMainThread();
state = newState;
if (state.valid) {
setText(highlightText(state));
setTextColor(getTextColor().normal);
} else {
setText(App.unspan(getText()));
setTextColor(getTextColor().error);
}
}
public void setEngine(@Nullable Engine engine) {
this.engine = engine;
}
@NonNull
private CharSequence highlightText(@Nonnull DisplayState state) {
final String text = state.text;
if (TextUtils.isEmpty(text)) {
return "";
}
final TextHighlighter textHighlighter = getTextHighlighter();
if (textHighlighter == null) {
return text;
}
try {
return textHighlighter.process(text).getCharSequence();
} catch (ParseException e) {
return text;
}
}
}