|Navigation: Templates > Guide to all Templates > Additional Libraries and Templates > RTFControl Class >====== RTFControlClass ======
Clarion's RTFControlClass and support templates are wrappers around Microsoft's Rich Edit Control DLL's. The presence of RichEdxx.DLL is required in the Windows/System directory. At press time, there are two versions of this DLL.
·Riched32.dll, wrapper Dll for Richedit 1.0
·Riched20.dll, Rich Text Edit Control, v3.x
More information regarding these versions can be obtained from the Microsoft web site:
Clarion's implementation of an RTF (Rich text format) control is a basic TEXT control, with an RTF attribute added. The rich text field can be saved to a field or to a separate text file. Other components of a rich text control include a Toolbar, Format Bar, and Ruler, and may be displayed (by default) or hidden at runtime.
The minimum size of a target RTF field is 256 characters. This is needed in order to maintain the rich text header information. If the field contains a lot of formatting a larger field size will be needed.
In prior versions of Clarion, the support for RTF controls required a special global template extension, a central RTF Control with limited options for modification, and a wide variety of code templates that were clumsy to implement.
The latest version of RTF templates have been greatly simplified, but at the same time made more flexible and powerful in configuration. Let's look at them now, and identify the new methods that they support.
This new RTFTextControl allows for easy integration of RTF support into all of your applications, with additional code and control template support through the RTFToolbar, RTFStatusBar, and the RTFAction Code Template.
The normal design flow of the new RTF text control support is as follows:
1.Populate the RTFTextControl
2.Populate the RTFToolbar
3.Populate the StatusBar
4.Add the RTFAction Code template for additional RTFcontrol functions and event embed points if needed.
The Context Menu interface (shown above) allows you to construct custom menu items to add to the existing popup menu used with the RTF control. You can select from a list of actions to attach to each menu item that you create. These actions include Execute Routine, Post Event to Control, Call a Procedure, or Run a Program
Adding the RTFTextControl offers the following additional template support:
The RTFToolBar Control Template populates a group of support controls to use with the RTFTextControl control template.
There are no template prompts for this control, but you can disable or hide controls that you do not want to provide to the user. You can also modify the icons and text used on each support control.
From left to right, top to bottom:
The New button clears the contents of the RTF Control.
RTF.Reset() !Call to RTF handler
RTFControlClass.FileName = ''
The Open button prompts you to load an external RTF file's contents into the RTF control
The Save button allows you to save the existing RTF control's contents to an external file.
The Print button prints the RTF control contents.
The Find button (the binoculars) opens the Find dialog window, allowing you to search for text in the target RTF control.
Find and Replace opens the Find and Replace dialog window, allowing you to search and replace target text in the RTF control.
Cut, Copy and Paste Performs the standard Windows cut, copy and paste actions for selected text in the RTF control.
RTFControlClass.Props.Cut() !calls to the RTFProperty INTERFACE
Undo and Redo allows you to undo the sequence of actions performed on an RTF control, and to redo those actions if needed.
RTFControlClass.Props.Undo() !calls to the RTFProperty INTERFACE
The Tab Stops button allows you to access the Tabs dialog. Set your tab stops in millimeters, inches, or twips. The default hotkey to move to the next tab stop is CTRL+TAB
The Paragraph Indents button allows you to access the Paragraph Indents dialog. Set the First line, Left side and Right side of the paragraph in millimeters, inches, or twips.
The Alignment buttons provide the standard alignment features (left, right, center, and full justification) for the selected text. The appropriate Alignment property is passed to the target methods.
Full justification is currently only supported in Rich Edit versions greater than 3.0. The presence of RichEd3x.DLL is required in the Windows System directory.
The Bullets and Numbering/Bullet Styles buttons add bullets or numbers and set the style with these buttons. Bullets and numbering can only be applied at the start of a paragraph.
( CHOOSE (NOT RTFControlClass.Bullets,|
!If Bullet Style button is pressed
Finally, the Font and Colors controls set all aspects of the active font and color to use in the RTF control.
The RTFStatusBar Control Template populates a simulated status bar made up of panel and string controls that can be applied to any window.
There are no template prompts for this control. The information contained in this template is shown below:
The RTFAction code template incorporates special support features for a target TEXT control that is using the RTF attribute. Use this code template with visual controls that identify the action that will be performed (e.g., a Save button to perform a Save action). The following actions, and supported prompts, are documented as follows:
The Save action writes the contents of the RTF control to a designated target. The drop list Mode specifies whether to write the contents in RichText or PlainText format. Your default can be either one of these formats, but if you haven't set the default mode in hand code, the default mode specified by the templates is RichText format.
The File Name sets the Save destination. This must be a CSTRING variable that you have defined, and be large enough to accommodate the full file name and path.
When switching to PlainText Mode, the AllowFormatChange method must return TRUE to allow the internal default interface to switch formats from RTF to PlainText. Use the method's embed point, and set the ReturnValue of the method to TRUE:
ReturnValue = TRUE
The SaveAs action is very similar to Save, but SaveAs will always present a Save dialog window to the user.
The Load action is used to load the contents of an external RTF filename to the target RTF control. The File Name sets the target to load. As in the Save action, this must be a CSTRING variable that you have defined.
FindandReplace is used to launch a search and replace into a designated RTF control. The Find value is searched, and the value in the Replace by prompt replaces the Find value text.
The SelectedText action is used to move the current selected text to an external file name designated in the File Name prompt.
The SetFocus action is used to simply select an RTF control on a window. This could be useful in windows with multiple tab controls. A button could be used to “hot select” the RTF control.
The Print action is used to print the current contents of an RTF control. Enter a string or variable name to send the Windows Job Name to the Print Engine. Make sure to prepend an exclamation point to the variable name (Example - !MyPrintJobName)
The Touch action is used like Prop:Touched to generate an Accepted event on the RTF control. You can make the action variable by entering a valid expression in the Expression prompt. The default value is TRUE.
RTFControl1.Touch(CHOOSE(True,True,False)) !IF TRUE
RTFControl1.Touch(CHOOSE(False,True,False)) !IF FALSE
And finally, the Changed action is used to trigger the other supporting controls (like the status bar and toolbar controls) that a change has occurred, and will prompt the user to save any changes if they have not saved it yet. A value of TRUE (1) will be sent to the variable designated in the Variable prompt.
LOC:RTFChanged = RTFControl1.Changed()
Because rich text can include hidden information, the Changed Action can return TRUE even if there are no visible changes, and no calls to Touch(TRUE) have been executed.