c# - WPF RichTextBox increment font size -


as title suggests, aim increment/decrement font size of current selection of text inside richtextbox.

this may seem trivial, , in fact - long font size same text in textrange. when selection contains text different font sizes, the

range.getpropertyvalue(textelement.fontsizeproperty);

which use previous value of font size (necessary in order know set value to) returns dependencyproperty.unsetvalue .

not problem, fact there isn't method increment size, 1 explicitly set given value causing issue here.

i've considered trying parse textrange sub ranges different property values, seems convoluted way achieve should trivial.

how go this? in advance.

i think implementation, if existed, have exact same thing propose options limited:

if concern lot of operations, right , conceptual shortcut can think of apply scaletransform. of course going make appear work , isn't going change properties of selection.

if concern lot of clutter in user code, right i'd suggest hiding making own richtextbox , implementing incrementsizeofselection , decrementsizeofselection yourself.


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