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a0dca6a5be
Whenever the display list gets regenerated, we need to restore the code list view scroll position to the previous location in the file. This gets tricky when multiple lines are appearing or disappearing. We were saving the file offset of the line, but that works poorly when there's a multi-line comment associated with that offset, because we end up scrolling to the top of the comment whenever any part of the comment is at the top of the screen. We now track the file offset and the number of lines we were from the top of that offset's content. This works well unless we remove a lot of lines. If the adjusted line index would put us into a different file offset, we punt and just scroll to the top of the item. Also, fix a crasher in Edit Note. Also, fix behavior when the list shrinks while a line near the end of the file is selected. Also, change a few instances of "Color.FromArgb(0,0,0,0)" to use a common constant.
83 lines
3.3 KiB
C#
83 lines
3.3 KiB
C#
/*
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* Copyright 2019 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Windows;
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using System.Windows.Media;
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namespace CommonWPF {
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/// <summary>
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/// Miscellaneous helper functions.
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/// </summary>
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public static class Helper {
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public static Color ZeroColor = Color.FromArgb(0, 0, 0, 0);
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/// <summary>
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/// Measures the size of a string when rendered with the specified parameters. Uses
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/// the current culture, left-to-right flow, and 1 pixel per DIP.
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/// </summary>
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/// <remarks>
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/// The Graphics.MeasureString approach from WinForms doesn't work in WPF, but we can
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/// accomplish the same thing with the FormattedText class.
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/// </remarks>
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/// <seealso cref="https://stackoverflow.com/a/9266288/294248"/>
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/// <param name="str">Text to be displayed.</param>
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/// <param name="fontFamily">Font family for Typeface.</param>
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/// <param name="fontStyle">Font style for Typeface.</param>
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/// <param name="fontWeight">Font weight for Typeface.</param>
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/// <param name="fontStretch">Font stretch for Typeface.</param>
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/// <param name="emSize">Font size.</param>
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/// <returns>Width and height of rendered text.</returns>
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public static Size MeasureString(string str, FontFamily fontFamily, FontStyle fontStyle,
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FontWeight fontWeight, FontStretch fontStretch, double emSize) {
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FormattedText fmt = new FormattedText(
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str,
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CultureInfo.CurrentCulture,
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FlowDirection.LeftToRight,
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new Typeface(fontFamily, fontStyle, fontWeight, fontStretch),
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emSize,
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Brushes.Black,
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new NumberSubstitution(),
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1.0);
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return new Size(fmt.Width, fmt.Height);
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}
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/// <summary>
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/// Measures the size of a string when rendered with the specified parameters. Uses
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/// the current culture, left-to-right flow, and 1 pixel per DIP.
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/// </summary>
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/// <param name="str">Text to be displayed.</param>
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/// <param name="typeface">Font typeface to use.</param>
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/// <param name="emSize">Font size.</param>
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/// <returns>Width of rendered text.</returns>
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public static double MeasureStringWidth(string str, Typeface typeface, double emSize) {
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FormattedText fmt = new FormattedText(
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str,
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CultureInfo.CurrentCulture,
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FlowDirection.LeftToRight,
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typeface,
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emSize,
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Brushes.Black,
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new NumberSubstitution(),
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1.0);
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return fmt.Width;
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}
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}
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}
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