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Making an Info-Window with Scrolling Text
Author: Patrick Jansen | Website: http://orbita.starmedia.com/~pjv |

Adding the scrollbuttons and nessary triggers.

Open Movie Clip scrollDown and create 3 empty keyframes. At frame 1, insert the action:

stop ();

At frame 2 insert the actions

currentScroll = _parent.windowtext.scroll;
max = _parent.windowtext.maxscroll;
if (currentScroll 

Let's look at what this does. First the variable currentScroll  is set
 to the current scollvalue of scrolltext. It will return the number of
 the current topmost textline. Next, the variable max is set to the maximum
 textline which can show up as line 1 in the textfield scrolltext. For
 example, if your text is 40 lines and your textfield shows 7 lines, then max
 will result in a value of 33 (40 - 7) since when line 33 is shown as line 1
 in the textfield, it will show the rest of the text till line 40. Next comes
 an If statement. We just want to scroll untill it reaches the maximum scroll,
 so we check if the current textline is less then the maximum scrollable textline.
 If it is less, the continuously executed action in frame 2 of the loop frame
 2 - frame 3 will create a scrolling effect by getting the current scroll line
 and adding up 1 line, and we close the If statement.
To create a loop between frame 2 and 3, add the following action to frame 3

gotoAndPlay (2);

Now we'll repeat this for the Movie Clip scrollUp but with a little difference
in the scrollaction. Frame 1, insert action:

stop ();

At frame 2 insert the actions 

currentScroll = _parent.windowtext.scroll;
max = _parent.windowtext.maxscroll;
if (currentScroll> 1) {
 _parent.windowtext.scroll = currentScroll-1;
}

And in frame 3 the action

gotoAndPlay (2);
 The difference with scrollDown is in the If-statent of scrollUp.
Because the initial scrollvalue of a textfield is always 1, the first line
 of the textfield, we check that currentScroll (the current scroll value
 - read 'current visable first line number') is greater then 1. This way the
 text will scroll up only until it reaches the first line. This is done by the
 action between the If -statement, where we get the current scrollvalue of scrolltext
 and counting down 1 line. 
Noticed the use of _parent ? If you are a little bit familiar with Action
 Script you probably get this right away. If you got confused, the _parent
 indicates one level lower in the hierarchy of flash movieclips and/or loaded
 movies. currentScroll and max are local variables within the trigger
 Movie Clips scrollUp and scrollDown. These 2 Movie Clips are placed
 in the Movie Clip textMC.  scrolltext.scroll and scrolltext.maxscroll
 are properties of the textfield scrolltext which is directly situated
 in Movie Clip textMC. To addres properties from a Movie Clip with actions
 which reside within a nested Movie Clip, you need to use _parent before
 the variable.
Later we will need to add one more line of important Action Script to frame
 2. This line will keep setting the position of the dragable scrollbar when the
 scroll up or down buttons is clicked and held. 






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» Level Intermediate








Added: : 2001-01-25

Rating: 8.23 Votes: 123

Hits: 6461





» Author



 Patrick Jansen is a freelance flash-, graphic- and webdesigner. Born in Holland, currently residential in Brazil. Worked for the compagnies Lectric b.v. (www.lectric.nl) and NIC b.v. (www.notenbomer.nl).



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