Results for "Category: Custom Controls/ Forms/ Menus"

The Switchboard:A method for handling subclassing in ActiveX controls f you develop ActiveX controls and intend to subclass or hook a window, you'll very quickly discover a problem when you attempt to site multiple instances of your control. The subclassing, which worked fine with a single instance of your control, now no longer works and is, in fact, most likely is causing a GPF. Why is this happening? The AddressOf operator requires you to place the callback routine in a module. This module is shared between all instances of your control and the variables and subroutines that the module provide are not unique to each instance. The easiest way to visualize the problem is to imagine a shared phoneline (or a partyline as we hicks call it) where multiple parties are trying to dial a number, talk, and hangup, all at the same time. What's needed is an operator, a routine that controls the dialing (hooking), the talking (the callback routine), and who routes information to the instance of the control that requested it. The Switchboard subroutine (see below) and it's supporting code provides a method for subclassing from multiple instances of your ActiveX control. It is not memory intensive, nor is it slow. It's biggest weakness is that it is hardcoded to intercept particular messages (in this case, WM_SIZE, to trap resize events) and will require some minor modification on your part to use.

To center all of your forms nicely on the screen, use this as the first line in the Form_Load event--resolution independent. 'note:call this function like this: Center_Form Me

Show how to make a text box not beep but do something else when I hit the Enter key. This code example makes nothing happen, for an extended period of time:

How do I get my application on top?To make your window truly topmost, use the SetWindowPos API call

You can achieve some cool form wipes with judicious use of the Move method. For example, to draw a curtain from right to left use this routine. It is also possible to wipe a form from bottom to top, and from both sides to the middle, using similar routines

This code is reusable and small enough to paste into whatever you're doing and instantly have a form that has no need for a title bar.

The primary focus here is to allow you to display forms that are larger than the screen can show. Need an 8½" x 11" Form? NO Problem!The size used in this example is 8½" x 11", but it could just as easily be landscape, envelope, or any needed size.

handy code for clearing all text box controls at run-time so you don't have to bother doing it at design time. http://137.56.41.168:2080/VisualBasicSource/vbworkingwithtextbox.txt

Visual Basic 5.0 allows you to use UserControls to create ActiveX controls in your projects. The following code snippet does two things: It gets a reference to the form in which a UserControl is placed, and it gets a reference to that control on the form. by David Mendlen

Suppose you have a listbox with some elements and want to drag&drop a selected one into a textbox. http://137.56.41.168:2080/VisualBasicSource/vbdraganddrop.txt

The DegreesToXYsubroutine, calculates the X (horizontal) and Y (vertical) coordinates of any point, measured in degrees, on the circumference of a circle or ellipse.

This function allows the application to enter and exit exclusive mode. In this mode any message boxes or prompts from Windows and other applications will not show up infront of the program. This is useful when you don't want anything to come up infront of your application window.

Tells whether a form is loaded or not

Can Change The Shape of any form

Makes a Form Trans Parent

This subroutine shows how to Really put a ComboBox (or any control with a hWnd) onto a ToolBar (or any other control/window with a hWnd).

This code, which was inspired by a similar snippet of code by Ian Ippolito, permits tiling an image onto a form's background. This variant, though, resides in a module and is called by a form instead of residing within the form's code itself. This permits using the feature project-wide without redundant code all over the place.

This code, which was inspired by a similar snippet of code by Ian Ippolito, permits tiling an image onto an MDI parent form's background. Getting an image onto an MDI parent is easy. Getting a tiled one is another story. We could try using a Clipboard operation, or build a big tiled background and save it and then laod it into the MDI parent's Picture property, but these are nasty, anal-retentive, and likely to simply not work. This code, however, works...

This program creates awesome random shapes with your given specifications. With this, you may never see the same shape twice, and every one looks great! This I could proudfully say is an awesome program -- IMPRESSION IS GUARANTEED!!! Please let me know how you like it.

Ever wounder how to make those neat pop-up menus like you see when you right click on something? well, here is an easy to follow example!