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made text fields auto-scroll once they're too full

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This commit is contained in:
Ellpeck 2019-08-11 00:39:40 +02:00
parent c030d075dd
commit 2e8b311b00
2 changed files with 21 additions and 4 deletions
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21
MLEM.Ui/Elements/TextField.cs
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@ -20,6 +20,7 @@ namespace MLEM.Ui.Elements {
public float TextOffsetX = 4;
private IGenericFont font;
private double caretBlinkTimer;
private int textStartIndex;
public TextField(Anchor anchor, Vector2 size, IGenericFont font = null) : base(anchor, size) {
this.font = font;
@ -38,8 +39,23 @@ namespace MLEM.Ui.Elements {
textChanged = true;
}
}
if (textChanged)
if (textChanged) {
var length = this.font.MeasureString(this.Text).X * this.TextScale;
var maxWidth = this.DisplayArea.Width - this.TextOffsetX * 2;
if (length > maxWidth) {
for (var i = Math.Max(0, this.textStartIndex - 1); i < this.Text.Length; i++) {
var substring = this.Text.ToString(i, this.Text.Length - i);
if (this.font.MeasureString(substring).X * this.TextScale <= maxWidth) {
this.textStartIndex = i;
break;
}
}
} else {
this.textStartIndex = 0;
}
this.OnTextChange?.Invoke(this, this.Text.ToString());
}
};
}
@ -61,7 +77,8 @@ namespace MLEM.Ui.Elements {
}
batch.Draw(tex, this.DisplayArea, color);
var caret = this.IsSelected && this.caretBlinkTimer >= 0.5F ? "|" : "";
this.font.DrawCenteredString(batch, this.Text + caret, this.DisplayArea.Location.ToVector2() + new Vector2(this.TextOffsetX, this.DisplayArea.Height / 2), this.TextScale, Color.White * alpha, false, true);
var text = this.Text.ToString(this.textStartIndex, this.Text.Length - this.textStartIndex) + caret;
this.font.DrawCenteredString(batch, text, this.DisplayArea.Location.ToVector2() + new Vector2(this.TextOffsetX, this.DisplayArea.Height / 2), this.TextScale, Color.White * alpha, false, true);
base.Draw(time, batch, alpha);
}

4
Tests/Content/Fonts/TestFont.spritefont
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@ -11,7 +11,7 @@ with.
<!--
Modify this string to change the font that will be imported.
-->
<FontName>BitPotion</FontName>
<FontName>BitPotionExt</FontName>
<!--
Size is a float value, measured in points. Modify this value to change
@ -41,7 +41,7 @@ with.
If you uncomment this line, the default character will be substituted if you draw
or measure text that contains characters which were not included in the font.
-->
<!-- <DefaultCharacter>*</DefaultCharacter> -->
<DefaultCharacter>*</DefaultCharacter>
<!--
CharacterRegions control what letters are available in the font. Every