static void
updateScrollerProportion(ScrollView *sPtr)
{
float prop, value;
float oldV, oldP;
if (sPtr->flags.hasHScroller) {
oldV = WMGetScrollerValue(sPtr->hScroller);
oldP = WMGetScrollerKnobProportion(sPtr->hScroller);
prop = (float)sPtr->viewport->size.width/(float)sPtr->contentView->size.width;
if (oldP == 1.0)
value = 0;
else
value = (prop * oldV) / oldP;
WMSetScrollerParameters(sPtr->hScroller, value, prop);
}
if (sPtr->flags.hasVScroller) {
oldV = WMGetScrollerValue(sPtr->vScroller);
oldP = WMGetScrollerKnobProportion(sPtr->vScroller);
prop = (float)sPtr->viewport->size.height/(float)sPtr->contentView->size.height;
if (oldP == 1.0)
value = 0;
else
value = (prop * oldV) / oldP;
WMSetScrollerParameters(sPtr->vScroller, value, prop);
}
applyScrollerValues(sPtr);
}
static void
applyScrollerValues(WMScrollView *sPtr)
{
int x, y;
if (sPtr->contentView == NULL)
return;
if (sPtr->flags.hasHScroller) {
float v = WMGetScrollerValue(sPtr->hScroller);
int size;
size = sPtr->contentView->size.width-sPtr->viewport->size.width;
x = v * size;
} else {
x = 0;
}
if (sPtr->flags.hasVScroller) {
float v = WMGetScrollerValue(sPtr->vScroller);
int size;
size = sPtr->contentView->size.height-sPtr->viewport->size.height;
y = v * size;
} else {
y = 0;
}
x = WMAX(0, x);
y = WMAX(0, y);
W_MoveView(sPtr->contentView, -x, -y);
W_RaiseView(sPtr->viewport);
}
static void scrollCallback(WMWidget * scroller, void *self)
{
WMBrowser *bPtr = (WMBrowser *) self;
WMScroller *sPtr = (WMScroller *) scroller;
int newFirst;
#define LAST_VISIBLE_COLUMN bPtr->firstVisibleColumn+bPtr->maxVisibleColumns
switch (WMGetScrollerHitPart(sPtr)) {
case WSDecrementLine:
if (bPtr->firstVisibleColumn > 0) {
scrollToColumn(bPtr, bPtr->firstVisibleColumn - 1, True);
}
break;
case WSDecrementPage:
case WSDecrementWheel:
if (bPtr->firstVisibleColumn > 0) {
newFirst = bPtr->firstVisibleColumn - bPtr->maxVisibleColumns;
scrollToColumn(bPtr, newFirst, True);
}
break;
case WSIncrementLine:
if (LAST_VISIBLE_COLUMN < bPtr->usedColumnCount) {
scrollToColumn(bPtr, bPtr->firstVisibleColumn + 1, True);
}
break;
case WSIncrementPage:
case WSIncrementWheel:
if (LAST_VISIBLE_COLUMN < bPtr->usedColumnCount) {
newFirst = bPtr->firstVisibleColumn + bPtr->maxVisibleColumns;
if (newFirst + bPtr->maxVisibleColumns >= bPtr->columnCount)
newFirst = bPtr->columnCount - bPtr->maxVisibleColumns;
scrollToColumn(bPtr, newFirst, True);
}
break;
case WSKnob:
{
double floatValue;
double value = bPtr->columnCount - bPtr->maxVisibleColumns;
floatValue = WMGetScrollerValue(bPtr->scroller);
floatValue = (floatValue * value) / value;
newFirst = rint(floatValue * (float)(bPtr->columnCount - bPtr->maxVisibleColumns));
if (bPtr->firstVisibleColumn != newFirst)
scrollToColumn(bPtr, newFirst, False);
/*else
WMSetScrollerParameters(bPtr->scroller, floatValue,
bPtr->maxVisibleColumns/(float)bPtr->columnCount);
*/
}
break;
case WSKnobSlot:
case WSNoPart:
/* do nothing */
break;
}
#undef LAST_VISIBLE_COLUMN
}
static void
doScrolling(WMWidget *self, void *data)
{
ScrollView *sPtr = (ScrollView*)data;
float value;
int pos;
int vpsize;
float size;
if (sPtr->hScroller == (WMScroller *)self) {
pos = -sPtr->contentView->pos.x;
size = sPtr->contentView->size.width-sPtr->viewport->size.width;
vpsize = sPtr->viewport->size.width - sPtr->pageScroll;
} else {
pos = -sPtr->contentView->pos.y;
size = sPtr->contentView->size.height-sPtr->viewport->size.height;
vpsize = sPtr->viewport->size.height - sPtr->pageScroll;
}
if (vpsize <= 0)
vpsize = 1;
switch (WMGetScrollerHitPart(self)) {
case WSDecrementLine:
if (pos > 0) {
pos-=sPtr->lineScroll;
if (pos < 0)
pos = 0;
value = (float)pos / size;
WMSetScrollerParameters(self, value,
WMGetScrollerKnobProportion(self));
}
break;
case WSIncrementLine:
if (pos < size) {
pos+=sPtr->lineScroll;
if (pos > size)
pos = size;
value = (float)pos / size;
WMSetScrollerParameters(self, value,
WMGetScrollerKnobProportion(self));
}
break;
case WSKnob:
value = WMGetScrollerValue(self);
pos = value*size;
break;
case WSDecrementPage:
if (pos > 0) {
pos -= vpsize;
if (pos < 0)
pos = 0;
value = (float)pos / size;
WMSetScrollerParameters(self, value,
WMGetScrollerKnobProportion(self));
}
break;
case WSDecrementWheel:
if (pos > 0) {
pos -= vpsize/3;
if (pos < 0)
pos = 0;
value = (float)pos / size;
WMSetScrollerParameters(self, value,
WMGetScrollerKnobProportion(self));
}
break;
case WSIncrementPage:
if (pos < size) {
pos += vpsize;
if (pos > size)
pos = size;
value = (float)pos / size;
WMSetScrollerParameters(self, value,
WMGetScrollerKnobProportion(self));
}
break;
case WSIncrementWheel:
if (pos < size) {
pos += vpsize/3;
if (pos > size)
pos = size;
value = (float)pos / size;
WMSetScrollerParameters(self, value,
WMGetScrollerKnobProportion(self));
}
break;
case WSNoPart:
case WSKnobSlot:
break;
}
if (sPtr->hScroller == (WMScroller *)self) {
W_MoveView(sPtr->contentView, -pos, sPtr->contentView->pos.y);
} else {
W_MoveView(sPtr->contentView, sPtr->contentView->pos.x, -pos);
}
}
