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I am creating a dialog based application that loads from an XML configuration file. So, you don't know at run-time how many or which type of objects will be used. The objects that can be created are custom defined using GDI+ and include labels, buttons etc. A button maybe associated with a call to initialize a dll. My need is that each item loaded from the config file will need to do several things 1) Draw themselves 2) Hit testing.
So finally, on to my question. How can I dynamically load lets say 3 buttons and 3 labels and have them do their required functions.
During testing I am doing the following steps at compile time
1) creating the objects in OnInitDialog() CLabel* pLabel = new CLabel;
2) in my draw function I am adding pLabel->Draw()
3) in LButtonDown I am adding if(pLabel->IsHit()).... do something
So, I need to somehow keep list of buttons and list of labels then in the Draw() function for example I to say while( there are buttons) Draw yourself.
How would you go about tackling this?
Hope that makes since.
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IS there a base class for all these controls ? You need to keep a list of an object that is either a base class or a facade for the objects you want, and then loop through them to do anything with them. I'd have thought that by making the controls children of your window, they would draw themselves though.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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Christian,
I used the term control rather loosely. There is no base class for my controls.
They are just visual representations. The buttons are either bitamps or a
roundedrect for which I create a region for hit testing. So, they are not based
on any real control or window.
Actually I have looked at all of your GDI+ articles so thanks for writing them.
So, your saying keep a list of each kind of objects for example.
1) CLabel
2) CTextButton
3) CBitmapButton
If I create 3 CTextButton's
CTextButton* pTextBtn1 = new CTextButton; // arguments not shown for simplicity
CTextButton* pTextBtn2 = new CTextButton;
CTextButton* pTextBtn3 = new CTextButton;
I don't understand how to create a dynamic list of CTextButton's for looping thru.
Sorry for being so dense.
PS: As a side question how do you determine the length of text that you have drawn?
I am trying to draw some text (ie Friday, November 3, 2003 10:59 PM ) then find the
bounding rect for it so that I can invalid the rect for smooth updating. Since font
type is user configurable the size of the bounding box varies. I know how to find
the height of a font but I have not figured out how to find the width.
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smesser wrote:
So, your saying keep a list of each kind of objects for example.
No, I'm saying keep one list of all objects, by deriving them all from a base class which defines the common functionality, such as a Draw() method.
smesser wrote:
I don't understand how to create a dynamic list of CTextButton's for looping thru.
Sorry for being so dense.
Look up my STL articles, basically you put them in a std::list or std::vector, and then use for_each to step through them and call the required method, such as Draw in OnPaint.
smesser wrote:
PS: As a side question how do you determine the length of text that you have drawn?
A HDC or CDC has a method for doing that, but I don't recall what it's called, sorry.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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I see what your saying. I have not used STL but I guess it's time I start.
thanks for your input.
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GetTextExtent and friends.
Steve S
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Hi!
I write a MDI application to show large images. I also need a windows to show the overview of whole image. I dont know the best way to do it.
One thought is build a spliter window, but that will waste some space. Because the overview is small, for example 128*128, when take a vertical splitter the remaider space (640-128)*128 will be wasted.
Another is Draw the detail image and then draw the overview on left upper corner in OnDraw. But in my application, the image is draw by tile, not in once, so this method can't be accepted.
Third I think is best. A float window always on top of image views, I can show the overview in it. But i dont' know how to realize it. Is there any resource and code I can take as a reference?
Any idea?
Thank you!!
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When I activate my window,my window will not hide the other application window.like when you activate the win2k's desktop,you can see the application
you have run.
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How can the text, which appears on the button in the taskbar, be changed without changing the window's title bar?
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Hi
After all those hard things that I did to make this software, I faced a stupid error which stoped me.
I have two classes, these two need each other in their definition structure. So I've included the first one's header file in the second one's and vice versa. At this point an error appeared which says:
warning C4182: #include nesting level is 362 deep; possible infinite recursion
fatal error C1076: compiler limit : internal heap limit reached; use /Zm to specify a higher limit
I know what does it say and it's completely logical but I don't know how to solve it. I need a practical advice.
Thanks...
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In the header for each class, use a forward declaration of the other class instead of including the header, e.g.:
class MyClassB;
class MyClassA {
}Then, include the other class's header in the .cpp file.
#include "MyClassA.h"
#include "MyClassB.h"
- Mike
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Put this in class A's header, at the top:
class B;
then include the header file in the .cpp file, do the same on the other side. Then both headers know that the other class exists, which should be all they need to know.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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I have an app that can either be a chat client or a chat server.
I can run two instances of the app and use one a a client and one as a server.
I have them configured to use the local loop, but, when I send a message, it works fine but the 'OnRecieve' function in the server never gets called.
This is actually a program out of a book.
I can send the code if anyone can help.
Thanks!
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how do you clear a file, in plain c++ (console) and how do you put something into a buffer and then flush it to a file... again in c++(console), help. THX
<marquee>Universal Project... Soon to be a .net
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See the description of the mode argument in the fopen() documentation.
Use fflush() to flush the buffer, but remember that calling fflush() will not guarantee that data is written to disk if you have write caching enabled on your system.
/ravi
Let's put "civil" back in "civilization"
Home | Articles | Freeware | Music
ravib@ravib.com
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The solution you've been given is C. To do it in C++, try this:
#include <iostream>
std::ofstream myFile ("c:\\myfile.txt");
this will open the file in the default mode, which empties the file. The destructor will close the file, or you can call myFile.close(); if you need to.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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How can I force my own window BottomMost?Like Win2k's desktop window.Thanks
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Look up SetWindowPos, you can tell it not to move or resize the window with something like SWP_NOMOVE | SWP_NOSIZE, then there are flags you can set for the position in the Z order.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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Can you give me a example code?Thanks
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Not off the top of my head, type SetWindowPos into google and you'll be right.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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I use SetWindowPos(&wndBottom,0,0,0,0,SWP_NOSIZE | SWP_NOMOVE) in OnCreate(),
but I can't see any effect.
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From memory, there is wndBottom and also wndBottomMost. I believe the difference is that one moves it to the bottom and the other causes it to stay there.
I've not done any MFC for a good 18 months, so this is pretty rusty sort of advice, sorry 
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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Never mind,My dear friend,Thanks for your warmhearted advice.
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i've got my new you-beaut program ready to roll except for one thing, my program on the USB drive must autorun once it is connected..
I've been doing a bit of research on making my USB drive to autorun. Based on what i've gathered, "the device must not be marked as a removable media device" - <http: www.microsoft.com="" whdc="" hwdev="" bus="" usb="" usbfaq.mspx="">
would anybody know how to achieve this??
(i've considered writing a hook application to handle the autorun side of things. but i would consider this as the very last option)
thanx all
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Hi,
I've just started to use the mfc CPropertySheet and CPropertyPage classes. I've created 2 dialog resources, linked them to CPropertyPage based classes, added them to a CPropertySheet and displayed them. The tabs come up correctly and the dialog content is displayed correctly...
*BUT* I have combo boxes in each of the dialogs. When the button on the combo box is pressed to view the combo options of the box, you can't click on any of the options. No clicks anywhere in the property sheet dialog do anything. You can press the esc key and the combo options box disappears, allowing you to click on the form again.
I really need these combo boxes to be working. Is it something easy to modify to fix, what could be the problem? Any help with the solution would be great!
Thanks,
Dave
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