70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
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#include "VScrollBar.h"
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namespace ezui {
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VScrollBar::VScrollBar(Object* parentObject):ScrollBar(parentObject)
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{
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}
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VScrollBar::~VScrollBar() { }
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void VScrollBar::ScrollTo(Control* ctl)
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{
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if (ctl && ctl->Parent && ctl->Parent == this->Parent) {
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if (ctl->Parent->IsPendLayout()) {
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ctl->Parent->RefreshLayout();
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}
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//控件的矩形位置
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const Rect& ctlRect = ctl->GetRect();
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if (ctlRect.Y >= 0 && ctlRect.GetBottom() <= Height()) {
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return;
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}
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//出现在顶部
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int offset = this->m_offset - ctlRect.Y;
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if (ctlRect.Y > 0) {
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//出现在底部
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offset += this->m_viewLength - ctlRect.Height;
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}
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__super::ScrollTo(offset, Event::None);
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}
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}
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Rect VScrollBar::GetSliderRect() {
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Rect sliderRect;
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sliderRect.X = 0;
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sliderRect.Y = m_sliderPos;
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sliderRect.Width = Width();
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sliderRect.Height = m_sliderLength;
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if (this->Scrollable() && sliderRect.Height <= 0) {
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sliderRect.Height = 1;
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}
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return sliderRect;
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}
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void VScrollBar::GetInfo(int* viewLength, int* contentLength, int* scrollBarLength)
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{
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*viewLength = this->Parent->Height();
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*contentLength = this->Parent->GetContentSize().Height;
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*scrollBarLength = Height();
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}
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void VScrollBar::ParentSize(const Size& size) {
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this->SetRect({ size.Width - this->Width() ,0,this->Width(),size.Height });
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}
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void VScrollBar::OnMouseDown(const MouseEventArgs& arg) {
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__super::OnMouseDown(arg);
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Rect sliderRect = GetSliderRect();
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if (sliderRect.IsEmptyArea()) { return; }
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auto point = arg.Location;
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if (arg.Button == MouseButton::Left && sliderRect.Contains({ point.X,point.Y })) {
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m_mouseDown = true;
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this->m_lastPoint = point.Y;
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}
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}
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void VScrollBar::OnMouseMove(const MouseEventArgs& arg)
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{
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__super::OnMouseMove(arg);
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if (m_mouseDown) {
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auto point = arg.Location;
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int offsetY = point.Y - this->m_lastPoint;
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m_sliderPos += offsetY;
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m_lastPoint = point.Y;
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int offset = m_sliderPos * this->m_rollRate + 0.5;
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__super::ScrollTo(-offset, Event::OnMouseDrag);
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}
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}
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};
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