D2Editor:setExpression

D2Editor:setExpression is a function that is part of the D2Editor Library.

This function sets the contents of a D2Editor, and is a synonym of setText.

Syntax

D2Editor:setExpression(text, [cursor], [selection])
Sets the content to text, or appends it to a certain position if cursor is set. If selection is -1, no text is selected (?).

Example

function on.construction() -- or on.create if OS 3.1
	editor = D2Editor.newRichText()
	editor:move(0,0)
	editor:resize(200,100)
end

function on.charIn(char)
	currentText = editor:getExpression() -- or editor:getText()
	editor:setExpression(currentText .. char) -- or editor:setText(...)
	--Add char to the editor
end

function on.enterKey()
	on.charIn(string.char(10))
	--Add a new line
end

A very simple text editor (its actually more complicated, but it shows the basics).

Tips & Tricks

In order to insert some special template like MathBoxes, vectors shapes, angles etc., you have to put these in the setExpression argument :

• \\1angle : The text rendered inside is will be displayed under the "angle" shape
• \\1circle : Symbol for circle
• \\1keyword :
• \\1line : Symbol for line (parenthesis)
• \\1lineseg : Symbol for line segment
• \\1ray :
• \\1rtri :
• \\1subhead :
• \\1subscrp : Subscript text
• \\1supersc : Superscript text
• \\1title :
• \\1tri : Triangle symbol
• \\1vector : The text rendered inside is will be displayed under the vector arrow.
• \\1word :
• \\0el {content} : Inserts a MathBox with the content inside it.

For example, editor:setExpression("\\1vector AB") will render as : http://i.imgur.com/aqVd8.jpg

See also

• D2Editor.getExpression() :
• D2Editor.getExpressionSelection() :
• D2Editor.isVisible() :
• D2Editor.newRichText() :
• D2Editor.resize() :
• D2Editor.move() :
• D2Editor.setFocus() :
• D2Editor.setFontSize() :
• D2Editor.setFormattedText() :
• D2Editor.setMainFont() :
• D2Editor.setReadOnly() :