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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

Part of the Processing project - http://processing.org

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License version 2

as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software Foundation, Inc.

51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

package processing.mode.java;

import java.awt.Color;

import java.awt.Cursor;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionAdapter;

import java.util.ArrayList;

import java.util.List;

import java.util.stream.Collectors;

import javax.swing.JPanel;

import processing.app.Mode;

import processing.app.Sketch;

import processing.app.SketchCode;

import processing.app.ui.Editor;

import processing.core.PApplet;

import processing.mode.java.pdex.Problem;

/**

* Implements the column to the right of the editor window that displays ticks

* for errors and warnings.

* <br>

* All errors and warnings of a sketch are drawn on the bar, clicking on one,

* scrolls to the tab and location. Error messages displayed on hover. Markers

* are not in sync with the error line. Similar to Eclipse's right error bar

* which displays the overall errors in a document

public class MarkerColumn extends JPanel {

protected JavaEditor editor;

// static final int WIDE = 12;

private Color errorColor;

private Color warningColor;

// Stores error markers displayed PER TAB along the error bar.

private List<LineMarker> errorPoints = new ArrayList<LineMarker>();

public MarkerColumn(JavaEditor editor, int height) {

this.editor = editor;

Mode mode = editor.getMode();

errorColor = mode.getColor("editor.column.error.color");

warningColor = mode.getColor("editor.column.warning.color");

addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

scrollToMarkerAt(e.getY());

}

});

addMouseMotionListener(new MouseMotionAdapter() {

public void mouseMoved(final MouseEvent e) {

showMarkerHover(e.getY());

}

});

}

@Override

public void repaint() {

recalculateMarkerPositions();

super.repaint();

}

@Override

public void paintComponent(Graphics g) {

g.drawImage(editor.getJavaTextArea().getGutterGradient(),

0, 0, getWidth(), getHeight(), this);

int currentTabIndex = editor.getSketch().getCurrentCodeIndex();

for (LineMarker m : errorPoints) {

Problem problem = m.problem;

if (problem.getTabIndex() != currentTabIndex) continue;

if (problem.isError()) {

g.setColor(errorColor);

} else {

g.setColor(warningColor);

}

g.drawLine(2, m.y, getWidth() - 2, m.y);

}

public void updateErrorPoints(final List<Problem> problems) {

errorPoints = problems.stream()

.map(LineMarker::new)

.collect(Collectors.toList());

repaint();

}

/** Find out which error/warning the user has clicked and scroll to it */

private void scrollToMarkerAt(final int y) {

try {

LineMarker m = findClosestMarker(y);

if (m != null) {

editor.highlight(m.problem);

}

} catch (Exception ex) {

ex.printStackTrace();

}

@Override

public JToolTip createToolTip() {

return new ErrorToolTip(editor.getMode(), this);

}

/** Show tooltip on hover. */

private void showMarkerHover(final int y) {

try {

LineMarker m = findClosestMarker(y);

if (m != null) {

Problem p = m.problem;

// String kind = p.isError() ?

// Language.text("editor.status.error") :

// Language.text("editor.status.warning");

// setToolTipText(kind + ": " + p.getMessage());

editor.statusToolTip(MarkerColumn.this, p.getMessage(), p.isError());

setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

}

} catch (Exception ex) {

ex.printStackTrace();

}

private void recalculateMarkerPositions() {

if (errorPoints != null && errorPoints.size() > 0) {

Sketch sketch = editor.getSketch();

SketchCode code = sketch.getCurrentCode();

int currentTab = sketch.getCurrentCodeIndex();

int totalLines = PApplet.max(1, code.getLineCount()); // do not divide by zero

int visibleLines = editor.getTextArea().getVisibleLines();

totalLines = PApplet.max(totalLines, visibleLines);

int topMargin = 20; // top scroll button

int bottomMargin = 40; // bottom scroll button and horizontal scrollbar

int height = getHeight() - topMargin - bottomMargin;

for (LineMarker m : errorPoints) {

Problem problem = m.problem;

if (problem.getTabIndex() != currentTab) continue;

// Ratio of error line to total lines

float ratio = (problem.getLineNumber() + 1) / ((float) totalLines);

// Ratio multiplied by height of the error bar

float y = topMargin + ratio * height;

m.y = (int) y;

}

private LineMarker findClosestMarker(final int y) {

LineMarker closest = null;

int closestDist = Integer.MAX_VALUE;

for (LineMarker m : errorPoints) {

int dist = Math.abs(y - m.y);

if (dist < 3 && dist < closestDist) {

closest = m;

closestDist = dist;

}

return closest;

}

public Dimension getPreferredSize() {

return new Dimension(Editor.RIGHT_GUTTER, super.getPreferredSize().height);

}

public Dimension getMinimumSize() {

return new Dimension(Editor.RIGHT_GUTTER, super.getMinimumSize().height);

}

/**

* Line markers displayed on the Error Column.

private static class LineMarker {

/** y co-ordinate of the marker */

int y;

/** Problem that the error marker represents */

final Problem problem;

LineMarker(Problem problem) {

this.problem = problem;

}