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rumaniel/EllipsisUGUIText.cs

Last active March 24, 2023 03:33
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UGUI text extension for ellipsis text with '...'(unicode 8230)
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EllipsisUGUIText.cs
using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;
using System.Text;
public class EllipsisUGUIText : Text
{
private readonly StringBuilder updatedStringBuilder = new StringBuilder(50);
private const char ellipsis = (char)8230;
private string cachedText = "";
public override string text
{
get
{
return cachedText;
}
set
{
if (string.IsNullOrEmpty(value))
{
if (string.IsNullOrEmpty(cachedText))
return;
cachedText = "";
UpdateGenerateText();
SetVerticesDirty();
}
else if (cachedText != value)
{
cachedText = value;
UpdateGenerateText();
SetVerticesDirty();
SetLayoutDirty();
}
}
}
private void UpdateGenerateText()
{
m_Text = cachedText;
Vector2 extents = rectTransform.rect.size;
extents.x = extents.x < 0 ? -extents.x : extents.x;
if (extents.x / preferredWidth < 1)
{
float tempPrefferedWidth = preferredWidth;
var settings = GetGenerationSettings(Vector2.zero);
string tempString = m_Text;
while (extents.x / tempPrefferedWidth < 1)
{
tempString = tempString.Substring(0, tempString.Length - 1);
tempPrefferedWidth = cachedTextGeneratorForLayout.GetPreferredWidth(tempString, settings) / pixelsPerUnit;
}
updatedStringBuilder.Length = 0;
updatedStringBuilder.Append(tempString);
updatedStringBuilder.Append(ellipsis);
m_Text = updatedStringBuilder.ToString();
updatedStringBuilder.Length = 0;
}
}
readonly UIVertex[] m_TempVerts = new UIVertex[4];
protected override void OnPopulateMesh(VertexHelper toFill)
{
if (font == null)
return;
// We don't care if we the font Texture changes while we are doing our Update.
// The end result of cachedTextGenerator will be valid for this instance.
// Otherwise we can get issues like Case 619238.
m_DisableFontTextureRebuiltCallback = true;
Vector2 extents = rectTransform.rect.size;
var settings = GetGenerationSettings(extents);
cachedTextGenerator.Populate(m_Text, settings);
Rect inputRect = rectTransform.rect;
// get the text alignment anchor point for the text in local space
Vector2 textAnchorPivot = GetTextAnchorPivot(base.alignment);
Vector2 refPoint = Vector2.zero;
refPoint.x = (textAnchorPivot.x == 1 ? inputRect.xMax : inputRect.xMin);
refPoint.y = (textAnchorPivot.y == 0 ? inputRect.yMin : inputRect.yMax);
// Determine fraction of pixel to offset text mesh.
Vector2 roundingOffset = PixelAdjustPoint(refPoint) - refPoint;
// Apply the offset to the vertices
IList<UIVertex> verts = cachedTextGenerator.verts;
float unitsPerPixel = 1 / pixelsPerUnit;
//Last 4 verts are always a new line...
int vertCount = verts.Count - 4;
toFill.Clear();
if (roundingOffset != Vector2.zero)
{
for (int i = 0; i < vertCount; ++i)
{
int tempVertsIndex = i & 3;
m_TempVerts[tempVertsIndex] = verts[i];
m_TempVerts[tempVertsIndex].position *= unitsPerPixel;
m_TempVerts[tempVertsIndex].position.x += roundingOffset.x;
m_TempVerts[tempVertsIndex].position.y += roundingOffset.y;
if (tempVertsIndex == 3)
toFill.AddUIVertexQuad(m_TempVerts);
}
}
else
{
for (int i = 0; i < vertCount; ++i)
{
int tempVertsIndex = i & 3;
m_TempVerts[tempVertsIndex] = verts[i];
m_TempVerts[tempVertsIndex].position *= unitsPerPixel;
if (tempVertsIndex == 3)
toFill.AddUIVertexQuad(m_TempVerts);
}
}
m_DisableFontTextureRebuiltCallback = false;
}
}
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