![]() ![]() If you do go UNICODE, save yourself any headaches by enabling right now the display of UNICODE strings while debugging (Tools/Options, Debug tab) and by reading Chris Maunder's article, Unicode, MBCS and Generic text mappings. Very briefly, you would need to add the defines _UNICODE and UNICODE to the preprocessor defines (Project Settings, C/C++ tab) while making sure to remove the _MBCS define, and then add wWinMainCRTStartup as the entry-point symbol (Project Settings, Link tab, Category 'Output'). [Aside: This is also a good time to create UNICODE project configurations if these are needed (I have included them in the demo project for the enthusiastic internationalist). Level 4 will ensure that anything suspicious is brought up to our attention so that it is up to us to decide what to do with 'informational warnings which in most cases can be safely ignored' (from the docs). Create a new dialog-based project, and set the warning level to 4 (Project Settings, C/C++ tab). The instructions, explanations, and the code below do amount to the development of the custom tree control in the image above. The keen reader may like to know that I have written this tutorial as I wrote the demo project. The standard CTreeCtrl control only allows single-line text per node (no wrap), each limited to some 260 chars, so I have decided to resolve this colossal catastrophe by means of an "extra" feature, namely, auto-resizing multiline (wrapping) text. The target is a tree control implementing the most elementary functionality: insertion and removal of nodes, expand/collapse on single click, vertical scroll (scrollbar and mouse-wheel), some eye-candy (color and font, bitmap background), and owner-drawn audio context-menu. Remember however, that, in general, it is not a good idea to develop custom controls from scratch unless the functionality one wants to implement is clearly outside of the standard, and that, in no way, the code introduced here is meant to replace the available MFC CTreeCtrl. I would now like to move on to the development of a simple tree control using a slightly different approach, namely, using a CStatic control as the base class.Īs I explained earlier, my intended audience is the rookie programmer, and my only goal is to show how the basic functionality of apparently complex GUI controls can be recreated with relatively straightforward code. In a previous tutorial ( CWinListBox), I discussed the step-by-step creation of a listbox from scratch, as a custom control derived from CWin. Download sample application and Wav files - 415 Kb.Download demo project and Wav files - 425 Kb. ![]() # A helper function that will wrap a given value based on column width Item = NewTree.insert("", "end", values=("i want to wrap this text","and this text")) The following code uses the event to dynamically wrap the text (so resizing the columns is supported, and the text will "wrap" accordingly). Implementing recommendation system for unsupervised learning. ![]()
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