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added vertical movement to multiline text fields

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Ell 2021-10-13 17:13:56 +02:00
parent aeff345a35
commit 45f970e0f2
1 changed files with 54 additions and 3 deletions
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57
MLEM.Ui/Elements/TextField.cs
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@ -178,9 +178,6 @@ namespace MLEM.Ui.Elements {
/// If this is true, pressing <see cref="Keys.Enter"/> will insert a new line into the <see cref="Text"/> if the <see cref="InputRule"/> allows it.
/// Additionally, text will be rendered with horizontal soft wraps, and lines that are outside of the text field's bounds will be hidden.
/// </summary>
/// <remarks>
/// Moving up and down through the text field, and clicking on text to start editing at the mouse's position, are currently not supported.
/// </remarks>
public bool Multiline {
get => this.multiline;
set {
@ -263,6 +260,10 @@ namespace MLEM.Ui.Elements {
this.CaretPos--;
} else if (this.Input.IsKeyPressed(Keys.Right)) {
this.CaretPos++;
} else if (this.Multiline && this.Input.IsKeyPressed(Keys.Up)) {
this.MoveCaretToLine(this.CaretLine - 1);
} else if (this.Multiline && this.Input.IsKeyPressed(Keys.Down)) {
this.MoveCaretToLine(this.CaretLine + 1);
} else if (this.Input.IsKeyPressed(Keys.Home)) {
this.CaretPos = 0;
} else if (this.Input.IsKeyPressed(Keys.End)) {
@ -365,6 +366,31 @@ namespace MLEM.Ui.Elements {
this.HandleTextChange();
}
/// <summary>
/// Moves the <see cref="CaretPos"/> to the given line, if it exists.
/// Additionally maintains the <see cref="CaretPosInLine"/> roughly based on the visual distance that the caret has from the left border of the current <see cref="CaretLine"/>.
/// </summary>
/// <param name="line">The line to move the caret to</param>
/// <returns>True if the caret was moved, false if it was not (which indicates that the line with the given <paramref name="line"/> index does not exist)</returns>
public bool MoveCaretToLine(int line) {
var (destStart, destEnd) = this.GetLineBounds(line);
if (destEnd > 0) {
// find the position whose distance from the start is closest to the current distance from the start
var destAccum = "";
while (destAccum.Length < destEnd - destStart) {
if (this.Font.Value.MeasureString(destAccum).X >= this.caretDrawOffset) {
this.CaretPos = destStart + destAccum.Length;
return true;
}
destAccum += this.text[destStart + destAccum.Length];
}
// if we don't find a proper position, just move to the end of the destination line
this.CaretPos = destEnd;
return true;
}
return false;
}
/// <inheritdoc />
protected override void InitStyle(UiStyle style) {
base.InitStyle(style);
@ -498,6 +524,31 @@ namespace MLEM.Ui.Elements {
}
}
private (int, int) GetLineBounds(int boundLine) {
if (this.splitText != null) {
var line = 0;
var index = 0;
var startOfLineIndex = 0;
for (var d = 0; d < this.splitText.Length; d++) {
var split = this.splitText[d];
for (var i = 0; i < split.Length; i++) {
index++;
if (split[i] == '\n') {
if (boundLine == line)
return (startOfLineIndex, index - 1);
line++;
startOfLineIndex = index;
}
}
if (boundLine == line)
return (startOfLineIndex, index - 1);
line++;
startOfLineIndex = index;
}
}
return default;
}
/// <summary>
/// A delegate method used for <see cref="TextField.OnTextChange"/>
/// </summary>