<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span></span></div><div>Hi Jonas,<br><br>Many thanks for the useful information...<br><br>I used the Ubuntu Synaptic Manager to check for GTK2 libraries and found the following:<br><br>libgtk2.0-0:i386<br>libgtk2.0-common<br>libgtk2.0-0<br>libgtk2.0-bin<br><br>probably needed by Ubuntu apps still based on GTK 2 on my Ubuntu 12.04 LTS.<br><br>I requested Synaptic to install libgtk2.0-dev and could then compile and build for GTK 2 by using `pkg-config --cflags gtk+-2.0` and `pkg-config --libs gtk+-2.0` on the command line.<br><br>Synaptic manager also found some gtk/gdk 2.0 documentation, libgtk2.0-doc and libgdk-pixbuf2.0-doc and I installed these too. So, there is no conflict having GTK 2 and GTK 3 stuff on the same PC. <br><br>Ken<br><br><br></div> <div style="font-family: times new roman, new york, times, serif;
font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Jonas Kulla <nyocurio@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> Ken Resander <kresander@yahoo.com> <br><b><span style="font-weight: bold;">Cc:</span></b> "cairo@cairographics.org" <cairo@cairographics.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, 9 April 2013, 8:50<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [cairo] Cairo with GTK2 and GTK3<br> </font> </div> <br><div id="yiv1205312555"><div dir="ltr">Hi,<br><div class="yiv1205312555gmail_extra"><br><div class="yiv1205312555gmail_quote">2013/4/9 Ken Resander <span dir="ltr"><<a rel="nofollow" ymailto="mailto:kresander@yahoo.com" target="_blank"
href="mailto:kresander@yahoo.com">kresander@yahoo.com</a>></span><br><blockquote class="yiv1205312555gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div style="font-size:12pt;font-family:times new roman, new york, times, serif;"><div>I am a cairo newbie on Ubuntu 12.04 LTS using GTK+3.0.<br><br>I have read 'Changes that need to be done at the time of the switch' at Gnome Dev Centre which explains what is new for GTK+3.0. It mentions that "expose-event" signal has been replaced by a new "draw" signal. That is very clear, but I have seen examples in other forums of expose event used together with gtk_drawing_area_new, so I tried using it too:</div>
</div></div></blockquote><div><br></div><div style="">As you correctly read, there is no more "expose-event" signal in GTK3.0,</div><div style="">as it is replaced by "draw".</div><div><br></div><div> </div>
<blockquote class="yiv1205312555gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="font-size:12pt;font-family:times new roman, new york, times, serif;"><div>Event handlers for expose-event have a GdkEventExpose *event parameter that allows 'regions' to be updated. The draw handler does not have this parameter. Has updating regions been dropped in GTK+3.0 or can it be done in some other way? If so, where can I read about it?<br>
</div></div></div></blockquote><div><br></div><div style="">You can read about it <a rel="nofollow" target="_blank" href="https://developer.gnome.org/gtk3/3.5/chap-drawing-model.html">here</a>. Basically, the clip region is already applied</div><div style="">
to the cairo context before signal emission. I think you could query it</div><div style="">explicitly using calls you will find in the cairo docs, but I think for simple</div><div style="">cases simply drawing and letting cairo take care of clip based</div>
<div style="">optimizations is the easiest solution.</div><div><br></div><div> </div><blockquote class="yiv1205312555gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="font-size:12pt;font-family:times new roman, new york, times, serif;">
<div>GTK+3.0 came with Ubuntu 12.04LTS. I will also need to support GTK+2. Can GTK 3 and GTK 2 coexist on the same Ubuntu/Linux PC, for example as different shared object libraries or do I need to use two PCs? <br><br>I could build GTK3-only and GTK2-only versions or build a combined version that switches on gtk version as needed. Pros and cons?</div>
</div></div></blockquote><div><br></div><div style="">AFAIK, there is absolutely no problem with having two GTK versions</div><div style="">installed in parallel. After all, the library version number takes care of</div><div style="">
any collisions. Most people have been running applications with both</div><div style="">versions along side each other for as long as GTK3.0 has been released.</div><div> </div><blockquote class="yiv1205312555gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div style="font-size:12pt;font-family:times new roman, new york, times, serif;"><span class="yiv1205312555HOEnZb"><font color="#888888"><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman, new york, times, serif;">
Ken</div></font></span></div></blockquote><div><br></div><div style="">Jonas</div><div style=""><br></div></div><br></div></div>
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