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@ -501,6 +501,132 @@ public:
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void UpdateViewportCoordinates(Window *w);
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};
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/**
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* Scrollbar data structure
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*/
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class Scrollbar {
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private:
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const bool is_vertical; ///< Scrollbar has vertical orientation.
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uint16 count; ///< Number of elements in the list.
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uint16 cap; ///< Number of visible elements of the scroll bar.
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uint16 pos; ///< Index of first visible item of the list.
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public:
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Scrollbar(bool is_vertical) : is_vertical(is_vertical)
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{
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}
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/**
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* Gets the number of elements in the list
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* @return the number of elements
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*/
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FORCEINLINE uint16 GetCount() const
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{
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return this->count;
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}
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/**
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* Gets the number of visible elements of the scrollbar
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* @return the number of visible elements
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*/
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FORCEINLINE uint16 GetCapacity() const
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{
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return this->cap;
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}
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/**
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* Gets the position of the first visible element in the list
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* @return the position of the element
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*/
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FORCEINLINE uint16 GetPosition() const
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{
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return this->pos;
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}
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/**
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* Checks whether given current item is visible in the list
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* @param item to check
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* @return true iff the item is visible
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*/
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FORCEINLINE bool IsVisible(uint16 item) const
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{
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return IsInsideBS(item, this->GetPosition(), this->GetCapacity());
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}
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/**
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* Sets the number of elements in the list
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* @param num the number of elements in the list
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* @note updates the position if needed
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*/
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void SetCount(int num)
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{
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assert(num >= 0);
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assert(num <= MAX_UVALUE(uint16));
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this->count = num;
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num -= this->cap;
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if (num < 0) num = 0;
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if (num < this->pos) this->pos = num;
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}
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/**
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* Set the capacity of visible elements.
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* @param capacity the new capacity
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* @note updates the position if needed
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*/
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void SetCapacity(int capacity)
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{
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assert(capacity > 0);
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assert(capacity <= MAX_UVALUE(uint16));
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this->cap = capacity;
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if (this->cap + this->pos > this->count) this->pos = max(0, this->count - this->cap);
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}
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void SetCapacityFromWidget(Window *w, int widget, int padding = 0);
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/**
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* Sets the position of the first visible element
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* @param position the position of the element
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*/
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void SetPosition(int position)
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{
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assert(position >= 0);
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assert(this->count <= this->cap ? (position == 0) : (position + this->cap <= this->count));
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this->pos = position;
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}
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/**
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* Updates the position of the first visible element by the given amount.
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* If the position would be too low or high it will be clamped appropriately
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* @param difference the amount of change requested
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*/
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void UpdatePosition(int difference)
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{
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if (difference == 0) return;
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this->SetPosition(Clamp(this->pos + difference, 0, max(this->count - this->cap, 0)));
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}
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/**
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* Scroll towards the given position; if the item is visible nothing
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* happens, otherwise it will be shown either at the bottom or top of
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* the window depending on where in the list it was.
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* @param position the position to scroll towards.
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*/
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void ScrollTowards(int position)
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{
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if (position < this->GetPosition()) {
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/* scroll up to the item */
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this->SetPosition(position);
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} else if (position >= this->GetPosition() + this->GetCapacity()) {
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/* scroll down so that the item is at the bottom */
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this->SetPosition(position - this->GetCapacity() + 1);
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}
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}
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int GetScrolledRowFromWidget(int clickpos, const Window * const w, int widget, int padding = 0, int line_height = -1) const;
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};
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/**
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* Nested widget to display and control a scrollbar in a window.
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* Also assign the scrollbar to other widgets using #SetScrollbar() to make the mousewheel work.
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