► |  | How to Design Programs Teachpacks

1 | Ht DP Teachpacks
2 | Ht DP/ 2e Teachpacks

▼ | 1 | Ht DP Teachpacks

1.1 | Manipulating Images: "image.ss"
1.2 | Simulations and Animations: "world.ss"
1.3 | Converting Temperatures: "convert.ss"
1.4 | Guessing Numbers: "guess.ss"
1.5 | Master Minding: "master.ss"
1.6 | Playing Master Mind: "master-play.ss"
1.7 | Simple Drawing: "draw.ss"
1.8 | Hangman: "hangman.ss"
1.9 | Playing Hangman: "hangman-play.ss"
1.10 | Managing Control Arrows: "arrow.ss"
1.11 | Manipulating Simple HTML Documents: "docs.ss"
1.12 | Working with Files and Directories: "dir.ss"
1.13 | Graphing Functions: "graphing.ss"
1.14 | Simple Graphical User Interfaces: "gui.ss"
1.15 | An Arrow GUI: "arrow-gui.ss"
1.16 | Controlling an Elevator: "elevator.ss"
1.17 | Lookup GUI: "lkup-gui.ss"
1.18 | Guess GUI: "guess-gui.ss"
1.19 | Queens: "show-queen.ss"
1.20 | Matrix Functions: "matrix.ss"

On this page:

control
view
connect

top← prev up next →

#### 1.17`` Lookup GUI: "lkup-gui.ss"

(require htdp/lkup-gui)

The teachpack provides three functions:

> > procedure

> > (control index) → symbol?

> index : natural-number?

reads out the indexth guess choice, starting with 0

> > procedure

> > (view msg) → true/c

> msg : (or/c string? symbol?)

displays its msg argument in the message panel

> > procedure

> > (connect event-handler) → true/c

> event-handler : (-> button% event% true/c)

connects a controller (handler) with the Check button displays frame

Example:

> (connect
> (lambda (e b)
> (view (control))))

This example simply mirrors what the user types in to the message field.
top← prev up next →