For my own project I found it rather frustrating that there seems to
be no existing control supporting ellipsis for text that won't fit
into a label with a defined width. There are some examples in the
internet but they all do not support ellipsis in the right way. The
following class will do this and I hope to receive some comments,
because I want to use it in a large web application and it is
important that it will work correctly. Since this took me only some
minutes to write, there is no license applied; you can use it as you
want. It looks a little bit complicated because it is very fast and
will work for very large texts as well:
public class LabelEllipsis extends Label{
private final int m_MaxHeight;
private String m_Content;
public LabelEllipsis (
String InContent,
int InWidth,
int InMaxHeight){
m_MaxHeight = InMaxHeight;
m_Content = InContent;
this.setWidth(InWidth + "px");
setText(m_Content);
}
@Override
protected void onLoad(){
setText(m_Content);
}
@Override
public void setText(String InContent){
if(!isAttached())
return;
String OldContent = m_Content;
super.setText(m_Content);
int Height = getOffsetHeight();
if(Height > m_MaxHeight){
float Ratio = (float)m_MaxHeight /
(float)Height - 0.1f; // < 1.0
m_Content = m_Content.substring(0,
Math.min(m_Content.length() -
4, (int)(m_Content.length() *
Ratio))) + "...";
super.setText(m_Content);
Height = getOffsetHeight();
if(Height < m_MaxHeight){
// add chars until max height is reached
while(Height < m_MaxHeight){
m_Content =
OldContent.substring(0, m_Content.length() - 2) +
"...";
super.setText(m_Content);
Height = getOffsetHeight();
}
// remove last char
m_Content = m_Content.substring(0,
Math.min(m_Content.length() - 4, m_Content.length() *
m_MaxHeight)) + "...";
super.setText(m_Content);
}else if(Height > m_MaxHeight){
// remove chars until max height is
reached
while(Height > m_MaxHeight){
m_Content =
m_Content.substring(0, m_Content.length() - 4) +
"...";
super.setText(m_Content);
Height = getOffsetHeight();
}
}
}
}
}
--~--~---------~--~----~------------~-------~--~----~
http://groups.google.com/group/Google-Web-Toolkit-Contributors
-~----------~----~----~----~------~----~------~--~---
