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(svn r21763) -Codechange: Pass the distance to Scrollbar::UpdatePosition() in units of small or big steps.

release/1.1
frosch 2011-01-09 20:39:06 +00:00
parent beb7f63746
commit da09ebc59a
2 changed files with 28 additions and 4 deletions
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4
src/widget.cpp
View File

@ -103,9 +103,9 @@ static void ScrollbarClickPositioning(Window *w, NWidgetScrollbar *sb, int x, in
Point pt = HandleScrollbarHittest(sb, mi, ma, sb->type == NWID_HSCROLLBAR);
if (pos < pt.x) {
sb->UpdatePosition(rtl ? sb->GetCapacity() : -sb->GetCapacity());
sb->UpdatePosition(rtl ? 1 : -1, Scrollbar::SS_BIG);
} else if (pos > pt.y) {
sb->UpdatePosition(rtl ? -sb->GetCapacity() : sb->GetCapacity());
sb->UpdatePosition(rtl ? -1 : 1, Scrollbar::SS_BIG);
} else {
_scrollbar_start_pos = pt.x - mi - 9;
_scrollbar_size = ma - mi - 23;

28
src/widget_type.h
View File

@ -556,9 +556,17 @@ private:
uint16 count; ///< Number of elements in the list.
uint16 cap; ///< Number of visible elements of the scroll bar.
uint16 pos; ///< Index of first visible item of the list.
uint16 stepsize; ///< Distance to scroll, when pressing the buttons or using the wheel.
public:
Scrollbar(bool is_vertical) : is_vertical(is_vertical)
/** Stepping sizes when scrolling */
enum ScrollbarStepping {
SS_RAW, ///< Step in single units.
SS_SMALL, ///< Step in #stepsize units.
SS_BIG, ///< Step in #cap units.
};
Scrollbar(bool is_vertical) : is_vertical(is_vertical), stepsize(1)
{
}
@ -608,6 +616,16 @@ public:
return this->is_vertical;
}
/**
* Set the distance to scroll when using the buttons or the wheel.
* @param stepsize Scrolling speed.
*/
void SetStepSize(uint16 stepsize)
{
assert(stepsize > 0);
this->stepsize = stepsize;
}
/**
* Sets the number of elements in the list
* @param num the number of elements in the list
@ -655,10 +673,16 @@ public:
* Updates the position of the first visible element by the given amount.
* If the position would be too low or high it will be clamped appropriately
* @param difference the amount of change requested
* @param unit The stepping unit of \a difference
*/
void UpdatePosition(int difference)
void UpdatePosition(int difference, ScrollbarStepping unit = SS_SMALL)
{
if (difference == 0) return;
switch (unit) {
case SS_SMALL: difference *= this->stepsize; break;
case SS_BIG: difference *= this->cap; break;
default: break;
}
this->SetPosition(Clamp(this->pos + difference, 0, max(this->count - this->cap, 0)));
}