DOCSLIB.ORG

<CHAPTER 5 CHAPTER TITLE ><#><Some Visual Basic Controls

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
<CHAPTER 5 CHAPTER TITLE ><#><Some Visual Basic Controls 1 Table of Contents User Interface Design: Visual Basic Controls and Events .......................................................................................5 3.1 Obtaining Open-Ended Input from the User: Text Box and Masked Text Box ...............................................6 Text Property of the Text Box ................................................................................................................................6 Understanding the Focus ...................................................................................................................................8 The Masked Text Box .............................................................................................................................................9 The Mask Property .......................................................................................................................................... 10 Selecting (Highlighting) a Portion of the Text ..................................................................................................... 11 3.2 Arranging Many VB Controls on a Form: Group Box and Tab Controls ............................................................ 14 The Group Box ..................................................................................................................................................... 14 Design Time Behavior ..................................................................................................................................... 15 Placing Controls in a Group Box ...................................................................................................................... 15 Run Time Behavior, Visible Property, and Enabled Property ......................................................................... 16 The Tab Control ................................................................................................................................................... 17 3.3 Data with Limited Number of Choices: Radio Buttons and Check Boxes .......................................................... 21 The Radio Button ................................................................................................................................................ 21 How Radio Buttons Work in Group ................................................................................................................ 21 Check Boxes for Independent Choices ................................................................................................................ 23 Difference in the Click Event Between the Check Box and the Radio Button ................................................ 25 The CheckState Property ................................................................................................................................ 26 3.4 Longer List of Known Items: List Boxes and Combo Boxes ............................................................................... 26 The List Box ......................................................................................................................................................... 26 Populating the List Box ................................................................................................................................... 27 The Items.RemoveAt Method ........................................................................................................................ 28 The Items.Count Property .............................................................................................................................. 29 2 The SelectionMode Property .......................................................................................................................... 29 The Sorted Property ........................................................................................................................................ 29 Versatility of the List Box ................................................................................................................................ 29 The SelectedItem and SelectedIndex Property .............................................................................................. 29 Identifying the Selected Items ........................................................................................................................ 30 The Checked List Box, a Variant ...................................................................................................................... 31 The Need for the Combo Box .............................................................................................................................. 32 Similar Properties ........................................................................................................................................... 32 Similar Methods .............................................................................................................................................. 33 The DropDownStyle Property ......................................................................................................................... 33 Between the List Box and Combo Box ............................................................................................................ 33 3.5 Graphics in the Visual Interface ................................................................................................................... 35 The Picture Box ................................................................................................................................................... 35 Setting the Image Property ............................................................................................................................. 36 The SizeMode Property .................................................................................................................................. 36 Images for Actions .......................................................................................................................................... 36 3.6 VB Controls in the Design of a Data-Entry Interface: Recapitulation .......................................................... 37 3.7 Naming the Controls and Setting the Tab Order ......................................................................................... 38 Naming Convention: Suggested Name Prefixes .................................................................................................. 38 Setting the Tab Order .......................................................................................................................................... 39 3.8 Some Commonly Used Events ..................................................................................................................... 40 Setting the Initial State at Runtime: The Form Load Event ................................................................................. 40 The Click Event: Buttons and List Boxes .............................................................................................................. 41 The CheckedChanged Event: Radio Buttons and Check Boxes ........................................................................... 42 SelectedIndexChanged and DoubleClick Events: List Box and Combo Box ........................................................ 42 3 Combo Box Events .......................................................................................................................................... 43 Viewing the Key Entered: The KeyPress Event .................................................................................................... 44 Before the User Does Anything in a Control: The Enter Event ........................................................................... 45 As the User Leaves the Field: The Leave Event ................................................................................................... 46 Summary of Events ............................................................................................................................................. 47 3.9 The Environ-Pure Project: An Application Example .................................................................................... 47 The Environ-Pure Project .................................................................................................................................... 48 The Visual Interface............................................................................................................................................. 48 Date of Order .................................................................................................................................................. 49 Distributor Number ........................................................................................................................................ 49 Model Number................................................................................................................................................ 49 Quantity Ordered ............................................................................................................................................ 49 Special Instructions ......................................................................................................................................... 50 Buttons and the Form ....................................................................................................................................
Load more

Recommended publications
  • Effects of Scroll Bar Orientation and Item Justification in Using List Box Widgets
    Effects of scroll bar orientation and item justification in using list box widgets G. Michael Barnes Erik Kellener California State University Northridge Hollywood Online Inc. 18111 Nordhoff Street 1620 26th St., #370S Northridge, CA 91330-8281 USA Santa Monica, CA 90404 +1 818 677 2299 +1 310 586 2020 [email protected] [email protected] Abstract List boxes are a common user interface component in graphical user interfaces. In practice, most list boxes use right-oriented scroll bars to control left-justified text items. A two way interaction hypothesis favoring the use of a scroll bar orientation consistent with list box item justification was obtained for speed of use and user preference. Item selection was faster with a scroll bar orientation consistent with list item justification. Subjects preferred left- oriented scroll bars with left-justified items and right-oriented scroll bars with right-oriented items. These results support a design principle of locality for user interface controls and controlled objects. Keywords List widgets, scroll bar, graphical user interface design, usability study Introduction This electronic publication is an updated statistical analysis of Erik Kellener’s unpublished masters’ thesis, “Are GUI Ambidexterous” completed at California State University Northridge, CA. 1996. List boxes are used in many graphical user interfaces (GUI) today. Whether its a desktop P.C., a personal digital assistant (PDA) or an information kiosk at the grocery store, list boxes are integrated into most GUIs. The list box GUI component is usually present in an interface that asks a user to make a selection from a list of items. The size of the list of items can vary significantly, however the screen area required by a list box is usually fixed.
    [Show full text]
  • How to Create and Maintain a Table of Contents
    How to Create and Maintain a Table of Contents How to Create and Maintain a Table of Contents Version 0.2 First edition: January 2004 First English edition: January 2004 Contents Contents Overview........................................................................................................................................ iii About this guide..........................................................................................................................iii Conventions used in this guide................................................................................................... iii Copyright and trademark information.........................................................................................iii Feedback.....................................................................................................................................iii Acknowledgments...................................................................................................................... iv Modifications and updates..........................................................................................................iv Creating a table of contents.......................................................................................................... 1 Opening Writer's table of contents feature.................................................................................. 1 Using the Index/Table tab ...........................................................................................................2 Setting
    [Show full text]
  • Screencreator Menus and Toolbars
    14 ScreenCreator Menus and Toolbars Chapter . Scr Menu Cr Menu Menu Librar Menu T Menu Menu Pr Menu Menu 4–2 The Menus and Toolbars ScreenCreator Menus The Screen Menu The Screen menu contains commands for creating a new screen, opening, closing or deleting screens, as well as printing a screen and editing all screen colors. If the Screen menu command can also be called by a Standard Toolbar tool, the tool is shown below the menu command. The large Screen menu on the near right is available when a screen is open. The small Screen menu on the Toolbars far right is available if no screen is open. The Menus and Screen > New creates and opens a new Untitled screen. Screen > Open... calls the Open Screen dialog box, allowing you to select and open a screen. Menus and Toolbars Selecting Simple Display is the opposite of Details in other Windows Open boxes and only shows the screen icons. 4–3 The Menus and Toolbars Screen > Open... Clicking Select... brings up the normal Windows Select Folder box. The Preview function can be The Menus and very useful for selecting the Toolbars right screen. All screens of the current project are shown. Screen > Close does just that, closes the selected screen. Screen > Save simply saves the current screen, with any changes you may have made. and Toolbars Menus 4–4 The Menus and Toolbars Screen > Save As... calls the Save Screen dialog box, allowing you to save the current screen (under a different name or under a different registration number). Compile When Saving can be deselected to allow creating and saving screens without assigning PLC addresses to parts.
    [Show full text]
  • Zoomtext Quick Reference Guide Version 10
    ZoomText Quick Reference Guide version 10 Contents Welcome to ZoomText 10 ................ 3 Cursor Enhancements ............................24 System Requirements ............................... 4 Focus Enhancements ..............................25 Installing ZoomText ................................. 5 Font Enhancements .................................26 Activating ZoomText ............................... 6 Desktop Finder ........................................27 Starting ZoomText .................................... 8 Web Finder ...............................................28 ZoomText User Interface ......................... 9 Text Finder ...............................................31 Enabling and Disabling ZoomText ...... 11 Smooth Panning ......................................33 Magnifier Toolbar .......................... 12 Reader Toolbar .............................. 35 Setting the Magnification level ............. 13 Turning Speech On and Off ...................36 Selecting a Zoom Window .................... 14 Adjusting the Speech Rate .....................37 Adjusting a Zoom Window ................... 16 Synthesizer Settings ................................38 Using the Freeze Window ..................... 17 Typing Echo .............................................39 Using View Mode ................................... 18 Mouse Echo ..............................................40 Dual Monitor Support ............................ 19 Verbosity...................................................41 Color Enhancements .............................
    [Show full text]
  • Using the Sharing Feature in Wimba
    Using the Sharing Feature in Wimba Overview of Application Sharing Sharing a Window Application Sharing allows you to share all or parts of your Description: desktop with other session participants. Selecting the Window radio button will allow you to share 1. To begin application sharing, click on the Share button in one window on your desktop. the Presenter’s Console. Advantages: This allows other participants to view the entire screen for a single application you have open on your desktop. Any changes you make within that window will be displayed synchronously on the screens of the other participants. For example, if you share an Internet browser window, then the participants can follow as you navigate from one website to another. Disadvantages: You can only share one Window at a time, so if you need to 2. Specify which desktop you wish to have shared by clicking display something from another application, you will need on the associated radio button in the Sharing Desktop to end the current Application Sharing session and start an‐ column. other one. To share a Window with other participants: 1. Select the Window radio button in the AppShare Selection dialog box. 3. Indicate where the content will be displayed by selecting the desired location from the “Display shared content in:” 2. Open the window you want to share, and drag the window drop‐down list: sharing icon and drop the icon on top of a screen a. Content Frame: within the open window. This will cause whatever you have Replaces the information currently displayed in the open in that window on your computer to be displayed in Content Frame.
    [Show full text]
  • Horizontally Scrollable Listboxes for Windows 3.X, Using C++
    Horizontally Scrollable ListBoxes for Windows 3.x, using C++ Ted Faison Ted is a writer and developer, specializing in Windows and C++. He has authored two books on C++, and has been programming in C++ since 1988. He is president of Faison Computing, a firm which develops C++ class libraries for DOS and Windows. He can be reached at [email protected] List boxes are among the most commonly used child controls in Windows applications. List boxes are typically used to show lists of files, fonts, or other variable-length lists of textual information. To add a list box to a dialog box, you generally edit a resource file, using programs such as Microsoft's Dialog Editor or Borland's Resource Workshop. Windows handles most of the list box details transparently. For example, if you add strings to a list box, Windows will automatically put a scroll bar on the control when the list box contains more strings than can be displayed in the client area of the list box. Windows handles scroll bar events - such as moving the thumb or clicking the up/down arrows - without any need for user code. Displaying a list of files in a list box is a somewhat easy task, because filenames have a predefined maximum number of characters. When you create the list box resource, you will generally make the control wide enough to display the longest filename. But what if you use a list box to display strings of varying and unknown length, such as the names of people or the titles of your CD collection ? You could obviously make the list box wide enough to accommodate the widest string you expect, but that would not only look pretty bad, but also waste a great deal of space on the screen.
    [Show full text]
  • Listbox User Manual
    LISTBOX USER MANUAL (Version: 1.2, December2015) This guide explains how to use the basic functionalities of the ListBox v 4.2. www.athensa.tv Legal notice The information in this manual is furnished for informational use only. No part of this manual may be reproduced or transmitt ed in any form or by any means, electronic or mechanical, for any purpose, without the prior written permission of ATHENSA LLC. The software, described in this manual, is owned by DMT Ltd and ATHENSA LLC. It is protected by Bulgarian Copyright Law, as well as by international copyright treaties, and may be used or copied only in accordance with the license agreement. ATHENSA LLC provides this manual “as is” without any warranty, either express, or implied. This publication may contain typographical errors or technical inaccuracies. While every precaution has been taken in the preparation of this document, ATHENSA LLC assumes no responsibility for errors or omissions. Nor is any liability assumed for damages, resulting from the use of the information, contained herein. Changes are periodically made to the information herein. They will be incorporated in new versions of the manual. Please, check the ATHENSA website regularly for User Manual updates. DMT Ltd. and/or ATHENSA may introduce changes or improvements in the products, described in this manual at any time, without any special notice. Please, address your comments or questions to: ATHENSA LLC 2970 Clairmont Road NE, Suite 640, Atlanta, Georgia 30329, USA Tel. +1 (404) 424 9283 Fax +1 (404) 835 1705 [email protected] https://athensa.tv/ 2 Contents LEGAL NOTICE..............................
    [Show full text]
  • The Three-Dimensional User Interface
    32 The Three-Dimensional User Interface Hou Wenjun Beijing University of Posts and Telecommunications China 1. Introduction This chapter introduced the three-dimensional user interface (3D UI). With the emergence of Virtual Environment (VE), augmented reality, pervasive computing, and other "desktop disengage" technology, 3D UI is constantly exploiting an important area. However, for most users, the 3D UI based on desktop is still a part that can not be ignored. This chapter interprets what is 3D UI, the importance of 3D UI and analyses some 3D UI application. At the same time, according to human-computer interaction strategy and research methods and conclusions of WIMP, it focus on desktop 3D UI, sums up some design principles of 3D UI. From the principle of spatial perception of people, spatial cognition, this chapter explained the depth clues and other theoretical knowledge, and introduced Hierarchical Semantic model of “UE”, Scenario-based User Behavior Model and Screen Layout for Information Minimization which can instruct the design and development of 3D UI. This chapter focuses on basic elements of 3D Interaction Behavior: Manipulation, Navigation, and System Control. It described in 3D UI, how to use manipulate the virtual objects effectively by using Manipulation which is the most fundamental task, how to reduce the user's cognitive load and enhance the user's space knowledge in use of exploration technology by using navigation, and how to issue an order and how to request the system for the implementation of a specific function and how to change the system status or change the interactive pattern by using System Control.
    [Show full text]
  • IG7013-Toolbars.Pdf
    Impress Guide Appendix B Toolbars Copyright This document is Copyright © 2021 by the LibreOffice Documentation Team. Contributors are listed below. You may distribute it and/or modify it under the terms of either the GNU General Public License (http://www.gnu.org/licenses/gpl.html), version 3 or later, or the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), version 4.0 or later. All trademarks within this guide belong to their legitimate owners. Contributors To this edition. Peter Schofield Dave Barton Feedback Please direct any comments or suggestions about this document to the Documentation Team’s mailing list: [email protected] Note Everything sent to a mailing list, including your email address and any other personal information that is written in the message, is publicly archived and cannot be deleted. Publication date and software version Published February 2021. Based on LibreOffice 7.0. Using LibreOffice on macOS Some keystrokes and menu items are different on macOS from those used in Windows and Linux. The table below gives some common substitutions for the instructions in this document. For a detailed list, see the application Help. Windows or Linux macOS equivalent Effect Tools > Options LibreOffice > Preferences Access setup options menu selection Right-click Control+click or right-click Open a context menu depending on computer setup Ctrl (Control) ⌘ (Command) Used with other keys F11 ⌘+T Open the Styles deck in the Sidebar Documentation for LibreOffice is available at
    [Show full text]
  • Windows 7 Group Policy
    Penn State Berks Collaborative Virtual Computer Lab (CVCLAB) Windows 7 Group Policy In Windows 7, Group Policy is used to define user and computer configurations for groups of users and computers. You may create a specific desktop configuration for a particular group of users and computers by using the Group Policy Microsoft Management Console. A. Accessing the Group Policy Editor 1. Click Start, then type mmc into the search box and press Enter. This will open the ​ ​ ​ ​ Microsoft Management Console. ​ 2. Under File, select Add/Remove Snap­In. Under Available snap­ins, click on Group ​ ​ ​ ​ ​ Policy Object Editor and then click Add >. ​ ​ ​ 3. In the window that appears, click Finish then click OK (note: If want to edit the Local ​ ​ ​ ​ Computer policy at other computers, click Browse to locate the group policy object that you want. Supply your user name and password if prompted, and then when you return to the Select Group Policy Object dialog box). 3. The selected Group Policy Object is now displayed in the Console Root as shown below: Penn State Berks Collaborative Virtual Computer Lab (CVCLAB) B. Example: Disabling Logoff Button from the Start Menu The following example illustrates the use of the Group Policy Editor to customize the Windows 7 user interface. In this example, we will use the Group Policy Editor to temporarily remove the Logoff button from the Start menu. To do this, follow these steps: ​ 1. To open the Microsoft Management Console, click Start, then type mmc into the ​ ​ ​ ​ search box and press Enter. Under Console Root, click the + next to Local ​ ​ ​ ​ ​ Computer Policy to expand the tree.
    [Show full text]
  • 1. the Following Program Creates a Graphical User Interface Allowing the User to Enter a Sequence of Numbers and Calculate Either the Largest Value Or the Sum
    1. The following program creates a graphical user interface allowing the user to enter a sequence of numbers and calculate either the largest value or the sum. Assume that the functions maxList and sumList each take a string as a parameter and return the appropriate value. For example, maxList("2 5 1 4") returns 5. from Tkinter import * #1 root = Tk() #2 f = Frame( root ) #3 f.pack() #4 def calculate(): #5 s = e.get() #6 r = v.get() #7 if r==1: #8 result = maxList(s) #9 else: #10 result = sumList(s) #11 l.configure( text = str(result) ) #12 l.update() #13 e = Entry( f ) #14 e.pack() #15 l = Label( f, text="" ) #16 l.pack() #17 v = IntVar() #18 r1 = Radiobutton( f, text = "Max", variable = v, #19 value = 1, command = calculate) #20 r1.pack() #21 r2 = Radiobutton( f, text = "Sum", variable = v, #22 value = 2, command = calculate) #23 r2.pack() #24 q = Button( f, text = "Quit", #25 command = root.destroy ) #26 q.pack() #27 root.mainloop() #28 (a) Explain the purpose of each line or group of lines in the program, and describe exactly how the user should interact with it. Ignore any errors that may occur due to inappropriate input. [20] (b) The question does not say what maxList and sumList do if their input is inappropriate. What would you like them to do, so that the user can see an error message in this case? You do not need to define maxList and sumList, but if your solution also requires modifications to calculate then you should define the new version of calculate.
    [Show full text]
  • Unit 2 Lesson 2.1-3
    Designing User Interface-1 Unit 2 Designing User Interface-1 Introduction In previous lesson, we have learned how to write simple Visual Basic code. In this lesson, we will learn how to work with some common controls and write codes for them. Some of the commonly used controls are label, text box, button, list box and combo box. However, in this lesson, we shall only deal with the text box the label, and buttons we shall deal with other controls later. Lesson 2.1-3 Adding Basic Controls Upon completion of this unit you will be able to . Place textbox control on the Form. Place label control on the Form. Place command button on the Form. Outcomes TextBox Controls The TextBox is the standard control for accepting input from the user as well as to display the output. For this reason, they tend to be the most frequently used controls in the majority of Windows applications. It can handle string (text) and numeric data but not images or pictures. String in a TextBox can be converted to a numeric data by using the function Val (text). In this section, we will discuss the most useful properties of TextBox controls. After you place a TextBox control on a form, you must set a few basic properties. The first thing I do as soon as I create a new TextBox control is clear its Textproperty. If this is a multiline field, I also set the MultiLineproperty to True. You can set the Alignment property of TextBox controls to left align, right align, or center the contents of the control.
    [Show full text]