/*
* Copyright 2000-2015 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 com.intellij.openapi.editor.impl;
import com.intellij.openapi.editor.ex.util.EditorUtil;
import org.jetbrains.annotations.NotNull;
import java.awt.*;
/**
* Allows to perform clipping checks for painting in editor.
* Using this class will be faster than direct calculations, if a lot of checks need to be performed in one painting sessions, and
* requests are mostly grouped by visual lines, as caching of intermediate data is performed.
*/
public class ClipDetector {
private final EditorImpl myEditor;
private final Rectangle myClipRectangle;
private int myVisualLineStartOffset = -1;
private int myVisualLineEndOffset = -1;
private int myVisualLineClipStartOffset;
private int myVisualLineClipEndOffset;
public ClipDetector(@NotNull EditorImpl editor, Rectangle clipRectangle) {
myEditor = editor;
myClipRectangle = clipRectangle;
}
public boolean rangeCanBeVisible(int startOffset, int endOffset) {
assert startOffset >= 0;
assert startOffset <= endOffset;
assert endOffset <= myEditor.getDocument().getTextLength();
if (myEditor.getSettings().isUseSoftWraps()) return true;
if (startOffset < myVisualLineStartOffset || startOffset > myVisualLineEndOffset) {
myVisualLineStartOffset = EditorUtil.getNotFoldedLineStartOffset(myEditor, startOffset);
myVisualLineEndOffset = EditorUtil.getNotFoldedLineEndOffset(myEditor, startOffset);
int visualLine = myEditor.offsetToVisualLine(startOffset);
int y = myEditor.visibleLineToY(visualLine);
myVisualLineClipStartOffset = myEditor.logicalPositionToOffset(myEditor.xyToLogicalPosition(new Point(myClipRectangle.x, y)));
myVisualLineClipEndOffset = myEditor.logicalPositionToOffset(myEditor.xyToLogicalPosition(new Point(myClipRectangle.x +
myClipRectangle.width, y)));
}
return endOffset > myVisualLineEndOffset || startOffset <= myVisualLineClipEndOffset && endOffset >= myVisualLineClipStartOffset;
}
}