147 lines
5.2 KiB
C#
147 lines
5.2 KiB
C#
/*
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Copyright (c) 2014, Lars Brubaker
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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The views and conclusions contained in the software and documentation are those
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of the authors and should not be interpreted as representing official policies,
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either expressed or implied, of the FreeBSD Project.
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*/
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using System;
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using System.Collections.Generic;
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using MatterHackers.Agg;
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using MatterHackers.Agg.Font;
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using MatterHackers.Agg.UI;
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using MatterHackers.VectorMath;
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namespace MatterHackers.MatterControl
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{
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public class TextScrollWidget : GuiWidget
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{
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event EventHandler unregisterEvents;
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List<string> sourceLines;
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TypeFacePrinter printer = new TypeFacePrinter();
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public RGBA_Bytes TextColor = new RGBA_Bytes(102, 102, 102);
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int forceStartLine = -1;
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public double Position0To1
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{
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get
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{
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if (forceStartLine == -1)
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{
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return 0;
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}
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else
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{
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return ((sourceLines.Count - (double)forceStartLine) / sourceLines.Count);
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}
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}
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set
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{
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forceStartLine = (int)(sourceLines.Count * (1 - value)) - 1;
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forceStartLine = Math.Max(0, forceStartLine);
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forceStartLine = Math.Min(sourceLines.Count - 1, forceStartLine);
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// If the start would be less than one screen worth of content, allow
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// the whole screen to have content and scroll with new material.
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if(forceStartLine > sourceLines.Count - NumVisibleLines)
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{
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forceStartLine = -1;
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}
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Invalidate();
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}
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}
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public int NumVisibleLines
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{
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get { return (int)Math.Ceiling(Height / printer.TypeFaceStyle.EmSizeInPixels); }
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}
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public TextScrollWidget(List<string> sourceLines)
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{
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printer.DrawFromHintedCache = true;
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this.sourceLines = sourceLines;
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PrinterOutputCache.Instance.HasChanged.RegisterEvent((sender, e) => { Invalidate(); }, ref unregisterEvents);
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}
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public void WriteToFile(string filePath)
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{
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System.IO.File.WriteAllLines(@filePath, sourceLines);
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}
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public override void OnClosed(EventArgs e)
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{
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if (unregisterEvents != null)
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{
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unregisterEvents(this, null);
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}
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base.OnClosed(e);
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}
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public override void OnDraw(Graphics2D graphics2D)
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{
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RectangleDouble Bounds = LocalBounds;
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int numLinesToDraw = NumVisibleLines;
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double y = LocalBounds.Bottom + printer.TypeFaceStyle.EmSizeInPixels * numLinesToDraw;
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int startLineIndex = sourceLines.Count - numLinesToDraw;
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if (forceStartLine != -1)
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{
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y = LocalBounds.Top;
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if (forceStartLine > sourceLines.Count - numLinesToDraw)
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{
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forceStartLine = -1;
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}
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else
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{
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// make sure we show all the lines we can
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startLineIndex = Math.Min(forceStartLine, startLineIndex);
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}
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}
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int endLineIndex = sourceLines.Count;
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for (int lineIndex = startLineIndex; lineIndex < endLineIndex; lineIndex++)
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{
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if (lineIndex >= 0)
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{
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if (sourceLines[lineIndex] != null)
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{
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printer.Text = sourceLines[lineIndex];
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printer.Origin = new Vector2(Bounds.Left + 2, y);
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printer.Render(graphics2D, TextColor);
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}
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}
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y -= printer.TypeFaceStyle.EmSizeInPixels;
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if (y < -printer.TypeFaceStyle.EmSizeInPixels)
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{
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break;
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}
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}
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base.OnDraw(graphics2D);
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}
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}
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}
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