At 09:47 PM 1/5/2009, Michael J. Sinclair, MD wrote:
Hi Dr.R,
Is there any way to drag and drop a picture? This could be a very useful
option to allow things like sorting photographs on computer screen.
Dr. Sinclair,
Looking at the list of supported controls that can be enabled for
Drag and Drop,
I don't see a DB Image or Variable Image on the list.
However, feel free to submit an enhancement request for R:BASE
eXtreme v9.0 (64)
for .RX? databases and R:BASE eXtreme v9.0 (32) for .RB? databases.
http://www.rbase.com/rbg9rdcc/
Remember, nothing is impossible!
Meanwhile, enjoy the latest versions and updates of R:BASE 7.6 and
Turbo V-8 for
Windows.
Very Best R:egards,
Razzak.
-------------- Original message from "A. Razzak Memon" <[email protected]>: ---
> Monday, January 5, 2009
>
> From the Edge: Using Drag and Drop Feature in Forms
> Section: Form Controls
> Chapter: Running R:BASE Your Way!
> Supported Versions: R:BASE 7.6 and Turbo V-8 for Windows
>
> Drag and Drop feature of R:BASE form controls lets you move data from one
> place in a form to another. This feature is especially useful in a visual
> application where you can drag data between two lists, drag controls in a
> container to reposition them, or drag components between containers.
>
> Before you can begin dragging, you must have something to drag -- that is,
> a drag source.
>
> Here's a comprehensive list of R:BASE form controls which can be enabled
> for Drag and Drop.
>
> -- Standard Controls
> . Static Text
>
> -- Database Controls
> . DB Label
> . DB Grid
> . DB Edit
> . DB Memo
> . DB E-Mail Label
> . DB CheckBox
> . DB Radio Button
> . DB RadioGroup
> . DB Lookup ComboBox
> . DB Lookup ListBox
> . DB Spin Edit
> . DB User Defined ComboBox
> . DB User Defined ListBox
> . DB Lookup ListView
>
> -- Variable Controls
> . Variable Label
> . Variable Edit
> . Variable Memo
> . Variable E-Mail Label
> . Variable CheckBox
> . Variable Radio Button
> . Variable Radio Group
> . Variable Lookup ComboBox
> . Variable Lookup ListBox
> . Variable Spin Edit
> . Variable User Defined ComboBox
> . Variable User Defined ListBox
> . Variable Lookup ListView
>
> -- Additional Controls
> . ListView
>
> Before I dive into the code, take a moment to download the sample
> application that accompanies this article and give it a quick
> run-through (Figure 1).
>
> -- Sample Applications: http://www.razzak.com/sampleapplications
>
> Application: Using Drag and Drop Feature in R:BASE Forms
> Supported Versions: R:BASE 7.6 and Turbo V-8 for Windows
> Date Posted: January 5, 2009
> Database: DragDrop
> Associated Forms: DragAndDropSample1, DragAndDropSample2
> Command File: UsingDragAndDrop.DAT
>
> Open this application using the latest available version and updates of
> R:BASE 7.6 or Turbo V-8 for Windows, then view both DragAndDropSample1
> and DragAndDropSample2 forms in form designer.
>
> To run this sample application, simply RUN UsingDragAndDrop.DAT file.
>
> (Figure 1)
> http://www.razzak.com/sampleapplications/UsingDragAndDrop_01.png
>
> Accessing Drag and Drop Properties:
>
> While in form designer, after placing the appropriate control on the
> form, you can access the Drag and Drop properties from the list of
> speed menu by using the right-click of your mouse (Figure 2).
>
> (Figure 2)
> http://www.razzak.com/sampleapplications/UsingDragAndDrop_02.png
>
> -- Drag and Drop (Sample 1):
>
> In the first example (using Drag and Drop Sample 1), you'll see five
> color swatches on the left representing the actual values of CustID,
> Company, CustAddress, CustCity, CustState and an empty Variable Memo
> box labeled "Drop It Here" on the right (Figure 3). The color swatches
> with values are drag sources, and the empty box is the drop target.
> Grab one of the color swatches with your mouse and drag it down to
> the box.
>
> (Figure 3)
> http://www.razzak.com/sampleapplications/UsingDragAndDrop_03.png
>
> Observe how the mouse cursor changes shape as the cursor enters it.
> Now drop the color swatch over the box. The box color changes color
> from white to match the swatch (Figure 4).
>
> (Figure 4)
> http://www.razzak.com/sampleapplications/UsingDragAndDrop_04.png
>
> Grab another color swatch and move it around the screen on the left.
> Notice that the swatch can only be dropped over the drop target, and
> that the cursor indicates whether a drop would be accepted if it
> occurred right now.
>
> -- Drag and Drop (Sample 2):
>
> In the second example (Using Drag and Drop Sample 2), you'll see a
> list of customers on the left with a caption Select Customer(s) to
> Review and an empty list view with a caption Selected Customer(s)
> to Review on the right (Figure 5).
>
> (Figure 5)
> http://www.razzak.com/sampleapplications/UsingDragAndDrop_05.png
>
> Grab one of the customers with your mouse and drag it down to the
> box on the right. Also notice that as you drag a customer to right,
> a partially transparent rendition of the customer data "drag visual"
> follows the cursor so you can see what you're dragging (Figure 6).
>
> (Figure 6)
> http://www.razzak.com/sampleapplications/UsingDragAndDrop_06.png
>
> -- The Basics:
>
> The basic sequence involved in drag-and-drop is:
>
> . Press, and hold down, the button on the mouse or other pointing
> device, to "grab" the object,
> . "Drag" the object/cursor/pointing device to the desired location,
> . "Drop" the object by releasing the button.
>
> Dragging requires more physical effort than moving the same pointing
> device without holding down any buttons. Because of this, a user cannot
> move as quickly and precisely while dragging. However, drag-and-drop
> operations have the advantage of thoughtfully chunking together two
> operands (the object to drag, and the drop location) into a single
> action.
>
> -- Enable Drag and Drop:
>
> This option specifies the "Drag and Drop" feature of the control.
>
> -- On Start Drag ...
>
> This event is fired whenever an item first dragged. Its is mainly used
> to initialize any variables that are needed for the drag operation as
> demonstrated in Drag and Drop Sample 1.
>
> -- On Drag Drop ...
>
> This event is fired whenever an item is dropped on a control. The
> majority of the code needed for implementing drag and drop is entered
> here.
>
> Take a look at the code implemented as "On Drag Drop" for Variable Memo
> (vColValue) in DragAndDropSample1 and both Variable Lookup ListViews in
> DragAndDropSample2.
>
> -- Note:
>
> . Sample application includes databases for both 7.6 and Turbo V-8 users.
>
> . Take your time and review the entire sample code embedded as
> "On Start Drag" and "On Drag Drop" for both DragAndDropSample1 and
> DragAndDropSample2 forms.
>
> . More Drag and Drop applications are included with 2009 Super Advanced
> Training Application (SAT 2009).
>
> PDF document of this article is also available at:
>
> From The Edge: http://www.razzak.com/fte/
>
> Have fun implementing Drag and Drop feature in forms!
>
> Very Best R:egards,
>
> Razzak.
