jetbrains.jetpad.cell.toDom.TextCellMapper.java Source code

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Here is the source code for jetbrains.jetpad.cell.toDom.TextCellMapper.java

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/*
 * Copyright 2012-2016 JetBrains s.r.o
 *
 * 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 jetbrains.jetpad.cell.toDom;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Timer;
import jetbrains.jetpad.base.Registration;
import jetbrains.jetpad.cell.Cell;
import jetbrains.jetpad.cell.TextCell;
import jetbrains.jetpad.model.event.CompositeRegistration;
import jetbrains.jetpad.model.event.EventHandler;
import jetbrains.jetpad.model.property.PropertyChangeEvent;
import jetbrains.jetpad.projectional.domUtil.DomTextEditor;

class TextCellMapper extends BaseCellMapper<TextCell> {
    private static final int CARET_BLINK_DELAY = 1000;

    private DomTextEditor myTextEditor;
    private long myLastChangeTime = System.currentTimeMillis();
    private boolean myCaretVisible = true;
    private boolean myContainerFocused;
    private Registration myFocusRegistration;

    TextCellMapper(TextCell source, CellToDomContext ctx) {
        super(source, ctx, DOM.createDiv());
        myContainerFocused = ctx.focused.get();
        myTextEditor = new DomTextEditor(getTarget());
    }

    @Override
    protected boolean isAutoChildManagement() {
        return false;
    }

    @Override
    protected void onDetach() {
        super.onDetach();

        if (myFocusRegistration != null) {
            myFocusRegistration.remove();
            myFocusRegistration = null;
        }
    }

    int getCaretOffset(int caret) {
        return (int) myTextEditor.getCaretOffset(caret);
    }

    int getCaretAt(int x) {
        return myTextEditor.getCaretPositionAt(x);
    }

    @Override
    protected boolean isLeaf() {
        return true;
    }

    @Override
    public void refreshProperties() {
        super.refreshProperties();

        Boolean focused = getSource().get(Cell.FOCUSED);
        if (focused) {
            if (myFocusRegistration == null) {
                final Timer timer = new Timer() {
                    @Override
                    public void run() {
                        if (System.currentTimeMillis() - myLastChangeTime < CARET_BLINK_DELAY)
                            return;
                        myCaretVisible = !myCaretVisible;
                        updateCaretVisibility();
                    }
                };
                timer.scheduleRepeating(500);
                myContainerFocused = getContext().focused.get();
                myFocusRegistration = new CompositeRegistration(
                        getContext().focused.addHandler(new EventHandler<PropertyChangeEvent<Boolean>>() {
                            @Override
                            public void onEvent(PropertyChangeEvent<Boolean> event) {
                                myContainerFocused = event.getNewValue();
                                updateCaretVisibility();
                            }
                        }), getSource().caretVisible().addHandler(new EventHandler<PropertyChangeEvent<Boolean>>() {
                            @Override
                            public void onEvent(PropertyChangeEvent<Boolean> event) {
                                if (event.getNewValue()) {
                                    myLastChangeTime = System.currentTimeMillis();
                                    myCaretVisible = true;
                                }
                            }
                        }), new Registration() {
                            @Override
                            protected void doRemove() {
                                timer.cancel();
                            }
                        });
            }
        } else {
            if (myFocusRegistration != null) {
                myFocusRegistration.remove();
                myFocusRegistration = null;
            }
        }

        myLastChangeTime = System.currentTimeMillis();

        myTextEditor.setText(getSource().text().get());
        myTextEditor.setCaretPosition(getSource().caretPosition().get());
        myTextEditor.setCaretVisible(getSource().caretVisible().get() && focused);
        myTextEditor.setTextColor(getSource().textColor().get());
        myTextEditor.setBold(getSource().bold().get());
        myTextEditor.setFontFamily(getSource().fontFamily().get());
        myTextEditor.setFontSize(getSource().fontSize().get());

        myTextEditor.setSelectionVisible(getSource().selectionVisible().get() && focused);
        myTextEditor.setSelectionStart(getSource().selectionStart().get());
    }

    private void updateCaretVisibility() {
        myTextEditor.setCaretVisible(myContainerFocused && myCaretVisible && getSource().caretVisible().get());
    }
}