MATLAB: How to detect the changes in figure size to invoke a callback function

callbackfiguresize;

I noticed that design and layout of a figure can be compromised when the figure's size or dimension is changed.

In most cases, use of 'Units' = 'normalized' can work, but not always.

For example, UI control buttons and sliders can be squashed by 'Units' = 'normalized'. To keep the size of uicontrol objects practical, you would have to change the 'Units' to 'px' and fix the size of buttons and sliders and then set them back to 'normalized'.

I wonder if this is possible with a callback function for figure object. Can a figure object detect its own change in size and invoke a callback function?

Best Answer

The 'SizeChangedFcn' property of the figure can be used for this.

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MATLAB: Is there a way that matlab can automatically change the font size of a figure, when the user changes the figure size

That code does not change the figure size: it changes the output size for printing purposes.

When a figure is submitted for printing, normally it is resized. That resize can be detected through a figure callback, which can change any property it likes.

There is no MATLAB "change all font sizes" command, but you can findall() of property 'fontsize' and operate on those objects.

I found in my programming that it was common to have a mix of font sizes in a figure. To avoid having to keep track of the sizes individually, I set a property on each text object to reflect the relative font size, such as "+1" for an object with a large font size. I could then search for objects with that property and do relative changes, and afterwards when resizing back down after printing, I could re-adjust appropriately. I happened to use part of the Tag property for this purpose, but you could use UserData.

MATLAB: How to make a push button respond to clicking with the right mouse button

There are two properties which can be used in conjunction to accomplish this.

One is the button's 'ButtonDownFcn' callback function. This callback function executes when pressing a mouse button on or near a UICONTROL object -- including when pressing the right mouse button.

The other property is the figure's 'SelectionType' property. This property indicates which kind of click was registered in the figure window -- including clicks on controls within the figure.

Putting these two together, you can define a 'ButtonDownFcn' callback for a push button which checks the figure's 'SelectionType' property to detect a right-click. An example is shown below. (In that example, the ANCESTOR function is used to get the figure's handle. If this is being done in a GUIDE-created GUI, this is unnecessary as the 'handles' structure already provides access to the figure's handle.)

function test
      uicontrol('Style', 'pushbutton', ...
                'ButtonDownFcn', @myCallback);
end
function myCallback(src, evt)
      figHandle = ancestor(src, 'figure');
      clickType = get(figHandle, 'SelectionType');
      if strcmp(clickType, 'alt')
          disp('right click action goes here!');
      end
end

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Related Solutions

MATLAB: Is there a way that matlab can automatically change the font size of a figure, when the user changes the figure size

MATLAB: How to make a push button respond to clicking with the right mouse button

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