Introduction
Have you ever thought of how annoying it actually was to spend a lotof time doing a basic GUI for your simple applications instead offocusing on the actual 'content'? Take for example a resizing dialog orproperty page. You need to write code for each control that will tellit where to go when the thing is resized, and this can take up a lot oftime. Now I know that I'm not the first one to give a solution to this (CResizableDialog), but this article is on my approach.
Description
Basically, all you need to do is design your dialog the way you want it to look in the resource editor (don't forget to make it resizable), and then define how the controls will behave when the dialog is resized using one single macro for each control.
Usage
Note that all this works exactly the same way with both CDialog and CPropertyPage
-
#includeEasySize.h to your stdafx.h (or put it in your include directory and#include<EasySize.h> , which I recommend) - Add
DECLARE_EASYSIZEanywhere in your class declaration: - Create an
OnInitDialoghandler if it doesn't already exist, and put this in the end of it: "INIT_EASYSIZE;" : - Create an
OnSizehandler and add theUPDATE_EASYSIZE;macro to it: - Optional - If you want your dialog to have a minimum size, then create an
OnSizinghandler and add theEASYSIZE_MINSIZEmacro as below: - Now you have to create the "EasySize Map" (or whatever you want to call it) in which you will specify the behavior of each dialog item. It can be placed anywhere inside your class implementation. The map looks like this:
Collapse
class CEasySizeDemoDlg : public CDialog
{
DECLARE_EASYSIZE
...
Collapse
BOOL CEasySizeDemoDlg::OnInitDialog()
{
CDialog::OnInitDialog();
...
INIT_EASYSIZE;
return TRUE; // return TRUE unless you set the focus to a control
}
Collapse
void CEasySizeDemoDlg::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);
UPDATE_EASYSIZE;
}
Collapse
void CEasySizeDemoDlg::OnSizing(UINT fwSide, LPRECT pRect)
{
CDialog::OnSizing(fwSide, pRect);
EASYSIZE_MINSIZE(280,250,fwSide,pRect);
}
//(in this example, 280 is the minimum width and 250 the
//minimum height we want our dialog to have)
Collapse
BEGIN_EASYSIZE_MAP(class_name)
...
EASYSIZE(control,left,top,right,bottom,options)
...
END_EASYSIZE_MAP
The map from the demo application looks like this:
Collapse
...
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
BEGIN_EASYSIZE_MAP(CEasySizeDemoDlg)
EASYSIZE(IDC_TITLE,ES_BORDER,ES_BORDER,
ES_BORDER,ES_KEEPSIZE,ES_HCENTER)
EASYSIZE(IDC_RADIO1,ES_BORDER,ES_BORDER,
ES_KEEPSIZE,ES_KEEPSIZE,0)
EASYSIZE(IDC_RADIO2,ES_BORDER,ES_BORDER,
ES_KEEPSIZE,ES_KEEPSIZE,0)
EASYSIZE(IDC_CONTENT,ES_BORDER,ES_BORDER,
ES_BORDER,ES_BORDER,0)
EASYSIZE(IDC_STATUSFRAME,ES_BORDER,ES_KEEPSIZE,
ES_BORDER,ES_BORDER,0)
EASYSIZE(IDC_STATUS,ES_BORDER,ES_KEEPSIZE,
ES_BORDER,ES_BORDER,0)
EASYSIZE(IDOK,ES_KEEPSIZE,ES_KEEPSIZE,
ES_BORDER,ES_BORDER,0)
EASYSIZE(IDCANCEL,ES_KEEPSIZE,ES_KEEPSIZE,
ES_BORDER,ES_BORDER,0)
EASYSIZE(IDC_MYICON1,ES_BORDER,IDC_RADIO2,IDC_CONTENT,
IDC_STATUSFRAME,ES_HCENTER|ES_VCENTER)
EASYSIZE(IDC_MYICON2,ES_BORDER,ES_BORDER,IDC_TITLE,
ES_KEEPSIZE,ES_HCENTER)
END_EASYSIZE_MAP
///////////////////////////////////////////////////////////////
// CEasySizeDemoDlg message handlers
...
Looks confusing? It's not once you get the point (and I know I'm not good at explaining it) Read on.
EASYSIZE Macro
The EASYSIZE macro is used in the EasySize Map to specify what behavior your controls will have on dialog resize. It looks like this:
Collapse
EASYSIZE(control,left,top,right,bottom,options)
control is the ID of the dialog item you want re-positioned (which will be referred to as the 'current control' further on).
left, top, right and bottom can be either the ID of another control in the dialog (not the current control), or one of the special values, ES_BORDER and ES_KEEPSIZE.
Basically, if you specify an ID, the distance from the current control and the item designated by the ID will remain the same when the dialog is resized: The current control will 'stick' to the other item. ES_BORDER works the same way as if you had specified a control ID, except that it's the distance between the current control and the dialog border that will be kept constant.Specifying ES_KEEPSIZE in, let's say left, will keep the width of the current control the same, and will make the current control right-aligned to whatever you specified in right. The width (or height, if you specified ES_KEEPSIZE in top or bottom) of the current control will always remain what it is in the dialog resource. (I know this explanation sucks, but look at the demo application if you are confused or post you question in the board below). Obviously ES_KEEPSIZE cannot be specified in both "left and right" or "top and bottom".
options can be a combination of ES_HCENTER, ES_VCENTER and 0 (use 0 if you don't want any of the other).ES_HCENTER horizontally centers the control between the two items specified in left and right (both of those can not be ES_KEEPSIZE!). The width of the current control will always remain the same as in the dialog resource. ES_VCENTER works the same way, but for vertical centering (using top and bottom, and where the height will remain constant).
Conclusion
Well I hope you figured out how this works, because it really can make your life easier. Note that using these macros will probably make your compiled code slightly bigger and slower than if you had coded the resizing routines manually, but in most cases the change is so small not even you will notice.
Last Update - Just corrected a few typos.
License
Thisarticle has no explicit license attached to it but may contain usageterms in the article text or the download files themselves. If in doubtplease contact the author via the discussion board below.
A list of licenses authors might use can be found here
转自：http://www.codeproject.com/KB/dialog/easysize.aspx