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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.android.terminal;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Paint.FontMetrics;
import android.graphics.Rect;
import android.view.View;
import android.os.SystemClock;
import android.util.Log;
import com.android.terminal.Terminal.TerminalClient;
/**
* Rendered contents of a {@link Terminal} session.
*/
public class TerminalView extends View {
private static final String TAG = "Terminal";
private final Context mContext;
private final Terminal mTerm;
private final Paint mBgPaint = new Paint();
private final Paint mTextPaint = new Paint();
private int mCharTop;
private int mCharWidth;
private int mCharHeight;
private TerminalClient mClient = new TerminalClient() {
@Override
public void damage(int startRow, int endRow, int startCol, int endCol) {
final int top = startRow * mCharHeight;
final int bottom = (endRow + 1) * mCharHeight;
final int left = startCol * mCharWidth;
final int right = (endCol + 1) * mCharWidth;
// Invalidate region on screen
postInvalidate(left, top, right, bottom);
}
@Override
public void bell() {
Log.i(TAG, "DING!");
}
};
public TerminalView(Context context, Terminal term) {
super(context);
mContext = context;
mTerm = term;
setBackgroundColor(Color.BLACK);
setTextSize(20);
// TODO: remove this test code that triggers invalidates
setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
v.invalidate();
}
});
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mTerm.setClient(mClient);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mTerm.setClient(null);
}
public void setTextSize(float textSize) {
mTextPaint.setTypeface(Typeface.MONOSPACE);
mTextPaint.setTextSize(textSize);
// Read metrics to get exact pixel dimensions
final FontMetrics fm = mTextPaint.getFontMetrics();
mCharTop = (int) Math.ceil(fm.top);
final float[] widths = new float[1];
mTextPaint.getTextWidths("X", widths);
mCharWidth = (int) Math.ceil(widths[0]);
mCharHeight = (int) Math.ceil(fm.descent - fm.top);
updateTerminalSize();
}
/**
* Determine terminal dimensions based on current dimensions and font size,
* and request that {@link Terminal} change to that size.
*/
public void updateTerminalSize() {
if (getWidth() > 0 && getHeight() > 0) {
final int rows = getHeight() / mCharHeight;
final int cols = getWidth() / mCharWidth;
mTerm.resize(rows, cols);
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (changed) {
updateTerminalSize();
}
}
private static final int MAX_RUN_LENGTH = 128;
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final long start = SystemClock.elapsedRealtime();
// Only draw dirty region of console
final Rect dirty = canvas.getClipBounds();
final int rows = mTerm.getRows();
final int cols = mTerm.getCols();
final int startRow = dirty.top / mCharHeight;
final int endRow = Math.min(dirty.bottom / mCharHeight, rows - 1);
final int startCol = dirty.left / mCharWidth;
final int endCol = Math.min(dirty.right / mCharWidth, cols - 1);
final Terminal.CellRun run = new Terminal.CellRun();
run.data = new char[MAX_RUN_LENGTH];
// Positions of each possible cell
// TODO: make sure this works with surrogate pairs
final float[] pos = new float[MAX_RUN_LENGTH * 2];
for (int i = 0; i < MAX_RUN_LENGTH; i++) {
pos[i * 2] = i * mCharWidth;
pos[(i * 2) + 1] = -mCharTop;
}
for (int row = startRow; row <= endRow; row++) {
for (int col = startCol; col <= endCol;) {
mTerm.getCellRun(row, col, run);
mBgPaint.setColor(run.bgColor);
mTextPaint.setColor(run.fgColor);
final int y = row * mCharHeight;
final int x = col * mCharWidth;
final int xEnd = x + (run.colSize * mCharWidth);
canvas.save(Canvas.MATRIX_SAVE_FLAG | Canvas.CLIP_SAVE_FLAG);
canvas.translate(x, y);
canvas.clipRect(0, 0, run.colSize * mCharWidth, mCharHeight);
canvas.drawPaint(mBgPaint);
canvas.drawPosText(run.data, 0, run.dataSize, pos, mTextPaint);
canvas.restore();
col += run.colSize;
}
}
final long delta = SystemClock.elapsedRealtime() - start;
Log.d(TAG, "onDraw() took " + delta + "ms");
}
}
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