How can I modify this script to allow scrolling a text field with easing?
// ***************************************************************
// Needed functions **********************************************
// Rule of three
rot = function (a, b, x) {
return ((x * b) / a);
};
if (forceUpdate) {
// This creates a function that checks the textfield value and updates accordingly.
// This is needed because flash doesn't fire the onChanged() event when the textfield
// is changed by a loadvariables command.
// It's a bit ugly, but it's the only way
var cc = this.createEmptyMovieClip("stupidController", 31337);
cc.oldTx = tx.htmlText;
cc.onEnterFrame = function() {
if (this._parent.tx.htmlText != this.oldTx) {
// new text loaded/modified
this._parent.update();
};
};
}
// Resets the deal: reads the maximum number of visible lines
reset = function() {
tx.scroll = 1;
}
// Update: called when the scroll has to be redraw
update = function() {
if (!foreground.dragando) {
if (tx.maxscroll > 1) {
var totalLines = tx.bottomScroll - tx.scroll;
// Enables
_alpha = 100;
if (tx.scroll > tx.maxscroll) tx.scroll = tx.maxscroll; // fixes a weird error of not updating .scroll when a part of the text is deleted from the end of the string
foreground._height = rot(tx.maxscroll+totalLines,totalLines+1, background._height);
if (useFgHeight) foreground._height = fgHeight;
foreground._y = rot(tx.maxscroll-1,tx.scroll-1,background._height-foreground._height);
foreground.onRollOver = background.onRollover = function() {
// The foreground should do nothing on rollover. This block is used
// to turn the movieclip into a "button", sort of.
}
foreground.useHandCursor = useHand;
background.useHandCursor = useHand;
} else {
// Disables
_alpha = disAlpha;
foreground._y = 0;
foreground._height = background._height;
delete (foreground.onRollover);
delete (background.onRollover);
foreground.useHandCursor = false;
background.useHandCursor = false;
}
}
}
// Scroller functions *********************************************
foreground.onLoad = function () {
this.dragando = false;
this.offset = 0;
};
foreground.onMouseDown = function () {
// Checks if a drag should start
if (this.hitTest (_root._xmouse, _root._ymouse, false)) {
this.dragando = true;
this.offset = this._y - _parent._ymouse;
}
};
foreground.onMouseUp = function () {
// Ends drag, if any
this.dragando = false;
};
foreground.onMouseMove = function () {
// Move and update, if being dragged
if (this.dragando) {
this._y = _parent._ymouse + this.offset;
if (this._y < 0) this._y = 0;
if ((this._y + this._height) > this._parent.background._height) this._y = this._parent.background._height - this._height;
tx.scroll = Math.round(rot(this._parent.background._height-this._height, this._y, tx.maxscroll-1))+1;
}
}
// Background functions *********************************************
background.onMouseDown = function () {
// Verifies if the background has been clicked
var totalLines = tx.bottomScroll - tx.scroll;
if (this.hitTest (_root._xmouse, _root._ymouse, false) && !this._parent.foreground.hitTest (_root._xmouse, _root._ymouse, false)) {
if (this._parent._ymouse < this._parent.foreground._y) {
// Big scroll up
this.contador = 0;
this.onEnterFrame = function () {
if (this.contador % 5 == 0) tx.scroll -= totalLines;
this.contador++;
if (this._parent._ymouse >= this._parent.foreground._y) delete (this.onEnterFrame);
}
} else if (this._parent._ymouse > this._parent.foreground._y+this._parent.foreground._height) {
// Big scroll down
this.contador = 0;
this.onEnterFrame = function () {
if (this.contador % 5 == 0) tx.scroll += totalLines;
this.contador++;
if (this._parent._ymouse <= this._parent.foreground._y+this._parent.foreground._height) delete (this.onEnterFrame);
}
}
}
};
background.onMouseUp = function () {
delete (this.onEnterFrame);
};
// Mousewheel functions *********************************************
this.onEnterFrame = function() {
// Checks to see if it's inside this textfield's bounding box
// I can't use a object watch event because there might be different
// textfields on the same screen - an object property can't have
// two different watchers.
var mx = tx._parent._xmouse;
var my = tx._parent._ymouse;
if (mx >= tx._x && mx <= tx._x + tx._width && my >= tx._y && my <= tx._y + tx._height) {
// It's IN
// Mouse wheel movement is expressed in ticks, which are bigger
// than simple line movements - they depend on the current mouse
// wheel speed set on the user's system. This calculation is done
// to reach a reasonable rate of line movement according to the
// user's mouse wheel movement.
ticksPerLine = 60;
if ((_level0.__wheelDelta + 0) != 0) {
tx.scroll -= (_level0.__wheelDelta/ticksPerLine);
_level0.__wheelDelta = 0;
}
}
};
// Initializes ******************************************************
// Shortcuts
tx = _parent[textfield_name];
// Reset size to 1:1
background._height = this._height;
this._yscale = 100;
// Sets colors
clr = new Color(foreground);
clr.setRGB (fgColor);
foreground._alpha = fgAlpha;
clr = new Color(background);
clr.setRGB (bgColor);
background._alpha = bgAlpha;
delete (clr);
// Sets text update functions and initializes
tx.reset = reset;
tx.reset();
tx.onChanged = tx.onScroller = update;
tx.onChanged();
// End: sit down and wait ******************************************
stop();
