Re: Font style in widget->size_request

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All,

I fixed my problem, and it wasn't how I had described it. It turns out that I had not checked what type of units Pango was returning font sizes in, and I had needed to scale by the DPI of the screen. It turns out that the font description *is* available after you call gtk_widget_ensure_style in the size_request method.

Sorry about the confusion,
David Brigada

Paul Davis wrote:


On Tue, Mar 24, 2009 at 2:18 PM, David Brigada <brigad@xxxxxxx <mailto:brigad@xxxxxxx>> wrote:

    Hello,

    I am writing a graph widget for use in GTK+ applications.  I'm
    trying to calculate the minimum size for the widget from the text
    along the axes of the graph.  I use Cairo to draw the text, so I'm
    using the cairo_text_extents functions to calculate their sizes.

    However, I'm running into a problem where widget->style->font_desc
    does not seem to be returning a valid Pango font description.  When
    I call pango_font_description_get_size on the font_desc, it returns
    10 * PANGO_SCALE, which seems to be a default value when the style
    isn't initialized.  This causes my function to assume the incorrect
    font size when calculating its size request.  I tried calling
    gtk_widget_ensure_style on my widget before accessing the font_desc
    element, but that does not help.


at some point the development of GTK (i don't recall precisely where, but roughly in the vicinity of GTK 2.10), a change was made to the way styles "bind" to widgets. the key change was that a widget that is not attached to a GtkWindow doesn't have a style (yet).

i have several examples in my code where i need to do style-based size computation, and so I create a dummy GtkWindow, pack some (temporary, representative) widget into it (I do not show the window), then use ensure_style, and then do the computation, and then delete them both. the critical change was adding the widget to the (dummy) window. it was initially a very irritating change, but in the end a pretty trivial code change.

---p




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