/*
* 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.view;
import org.jetbrains.annotations.NotNull;
import java.awt.*;
/**
* Fragment of text using a common font
*/
abstract class TextFragment implements LineFragment {
@NotNull
final float[] myCharPositions; // i-th value is the x coordinate of right edge of i-th character (counted in visual order)
TextFragment(int charCount) {
assert charCount > 0;
myCharPositions = new float[charCount]; // populated by subclasses' constructors
}
@Override
public int getLength() {
return myCharPositions.length;
}
abstract boolean isRtl();
@NotNull
@Override
public LineFragment subFragment(int startOffset, int endOffset) {
assert startOffset >= 0;
assert endOffset <= myCharPositions.length;
assert startOffset < endOffset;
if (startOffset == 0 && endOffset == myCharPositions.length) return this;
return new TextFragmentWindow(startOffset, endOffset);
}
abstract int offsetToLogicalColumn(int offset);
@Override
public float offsetToX(float startX, int startOffset, int offset) {
return startX + getX(offset) - getX(startOffset);
}
float getX(int offset) {
return offset <= 0 ? 0 : myCharPositions[Math.min(myCharPositions.length, offset) - 1];
}
@Override
public int logicalToVisualColumn(float startX, int startColumn, int column) {
return column;
}
@Override
public int visualToLogicalColumn(float startX, int startColumn, int column) {
return column;
}
private class TextFragmentWindow implements LineFragment {
private final int myStartOffset;
private final int myEndOffset;
private final int myStartColumn; // logical
private final int myEndColumn; // logical
private TextFragmentWindow(int startOffset, int endOffset) {
myStartOffset = startOffset;
myEndOffset = endOffset;
myStartColumn = TextFragment.this.offsetToLogicalColumn(startOffset);
myEndColumn = TextFragment.this.offsetToLogicalColumn(endOffset);
}
@Override
public int getLength() {
return myEndOffset - myStartOffset;
}
@Override
public int getLogicalColumnCount(int startColumn) {
return myEndColumn - myStartColumn;
}
@Override
public int getVisualColumnCount(float startX) {
return myEndColumn - myStartColumn;
}
@Override
public int logicalToVisualColumn(float startX, int startColumn, int column) {
return column;
}
@Override
public int visualToLogicalColumn(float startX, int startColumn, int column) {
return column;
}
@Override
public float offsetToX(float startX, int startOffset, int offset) {
return TextFragment.this.offsetToX(startX, visualOffsetToParent(startOffset), visualOffsetToParent(offset));
}
@Override
public float visualColumnToX(float startX, int column) {
int startColumnInParent = visualColumnToParent(0);
float parentStartX = startX - TextFragment.this.visualColumnToX(0, startColumnInParent);
int columnInParent = visualColumnToParent(column);
return TextFragment.this.visualColumnToX(parentStartX, columnInParent);
}
@Override
public int[] xToVisualColumn(float startX, float x) {
int startColumnInParent = visualColumnToParent(0);
float parentStartX = startX - TextFragment.this.visualColumnToX(0, startColumnInParent);
int[] parentColumn = TextFragment.this.xToVisualColumn(parentStartX, x);
int column = parentColumn[0] - startColumnInParent;
int columnCount = getVisualColumnCount(startX);
return column < 0 ? new int[] {0, 0} : column > columnCount ? new int[] {columnCount, 1} : new int[] {column, parentColumn[1]};
}
private int visualOffsetToParent(int offset) {
return offset + (isRtl() ? myCharPositions.length - myEndOffset : myStartOffset);
}
private int visualColumnToParent(int column) {
return column + (isRtl() ? TextFragment.this.getVisualColumnCount(0) - myEndColumn : myStartColumn);
}
@Override
public void draw(Graphics2D g, float x, float y, int startOffset, int endOffset) {
TextFragment.this.draw(g, x, y, visualOffsetToParent(startOffset), visualOffsetToParent(endOffset));
}
@NotNull
@Override
public LineFragment subFragment(int startOffset, int endOffset) {
return TextFragment.this.subFragment(startOffset + myStartOffset, endOffset + myStartOffset);
}
}
}