In this post, we’ll use the EndInvoke property or DelphiVCL.Application.EndInvoke to block the caller until the specified ASyncResult completes. Learning how to do it will allow you to easily create GUIs with Python Windows GUI Builder.
Returns the result from the method that BeginInvoke asynchronously executes. This result is immediately returned after the given IAsyncResult…
In this post, we’ll use the DesignInfo property or DelphiVCL.Application.DesignInfo contains information used by the Form designer in Python Program Maker.
DesignInfo is used internally. Do not use this property in applications.
Let’s browse all the properties…
The ExeName property or DelphiVCL.Application.ExeName contains the file name of the application’s executable file including path information.
In this post, we’ll use Use ExeName to obtain the name of the executable file for the application. ExeName is the…
When the user invokes an action, a series of calls ensue to respond to that action. First, the action list that contains the action generates an OnExecute event. If the action list does not handle the OnExecute event, then the action is routed to the Application object’s ExecuteAction method, which invokes the OnActionExecute event handler. (The application’s ExecuteAction method…
Align or TAlign is used to specify the alignment of control within its parent. TAlign specifies how control is placed relative to its parent.
It can have one of the following values:
Value
Meaning
alNone
The control remains where it was placed.
State property is used as an indicator for which items are selected or checked.
For example, for each member of the Items array, we use State to determine whether the checkbox is selected (cbChecked), cleared (cbUnchecked), or dimmed (cbGrayed).
Note: cbGrayed…
DelphiVCL.Component is the common ancestor of all component classes.
Component is the base class for all components. Components are persistent objects that have the following capabilities:
IDE integration: The ability to appear on an IDE palette and be manipulated in a Form Designer.
Ownership: The ability to manage other components. If component A owns component B, then A is…
The Destroying method or DelphiVCL.Application.Destroying is used to indicate that the component and its owned components are about to be destroyed.
Destroying sets the csDestroying flag in the ComponentState property. It then calls the Destroying method for each…
The DestroyComponents method or DelphiVCL.Application.DestroyComponents is used to destroy all owned components.
DestroyComponents iterates through the components owned by the component, removing each from the list of owned components and destroying it.
It is…
Use the DefaultHandler method or DelphiVCL.Application.DefaultHandler to provide the interface for a method that processes message records.
DefaultHandler is called by Dispatch when it cannot find a method for a particular message. DefaultHandler provides message handling for all messages for which an object does not have specific handlers. Descendant classes that process messages override…
