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#include "StdAfx.h"
#include "T2DlgItemScr.h"
T2DlgItemScr::T2DlgItemScr(T2TowerDoc* towerDoc, T2ImageObj* imageObj, CPalette* palette)
: T2DlgItem(towerDoc, imageObj, palette)
{
mUpImage = 200;
mDownImage = 200;
mValue = 0;
mRange = 0;
mPage = 0;
mMouseDownPoint = CPoint(0, 0);
mClickedArea = 0;
}
/*virtual*/ void T2DlgItemScr::SetPage(int page) {
mPage = page;
if (!IsScrollable() && mValue != 0) {
mValue = 0;
Notify(GetDlgCtrlID(), 0, &mValue);
}
Invalidate();
}
/*virtual*/ void T2DlgItemScr::SetRange(int range) {
mRange = range;
if (!IsScrollable() && mValue != 0) {
mValue = 0;
Notify(GetDlgCtrlID(), 0, &mValue);
}
Invalidate();
}
/*virtual*/ void T2DlgItemScr::SetValue(int value) {
if (!IsScrollable())
value = 0;
if (mValue != value) {
mValue = value;
Notify(GetDlgCtrlID(), 0, &mValue);
Invalidate();
}
}
/*virtual*/ void T2DlgItemScr::OnT2DlgItemLButtonDown(UINT nFlags, CPoint pt) {
SetCapture();
m74 = true;
mTimerID = 0;
mClickedArea = ScrollBarHittest(pt);
if (mClickedArea != 0) {
if (mClickedArea == Area_Thumb) {
mMouseDownPoint = pt;
mMouseDownValue = mValue;
} else {
if (mClickedArea == Area_Up)
mUpImage = 100;
else if (mClickedArea == Area_Down)
mDownImage = 100;
ScrollBarAction(mClickedArea, 0);
if (mClickedArea == Area_Up || mClickedArea == Area_Down)
mTimerID = SetTimer(999, 100, NULL);
}
}
}
/*virtual*/ void T2DlgItemScr::OnT2DlgItemLButtonUp(UINT nFlags, CPoint pt) {
if (mClickedArea && mTimerID)
KillTimer(mTimerID);
ReleaseCapture();
m74 = false;
mUpImage = 0;
mDownImage = 0;
mClickedArea = 0;
Invalidate();
}
/*virtual*/ void T2DlgItemScr::OnT2DlgItemMouseMove(UINT nFlags, CPoint pt) {
if (mClickedArea) {
CRect clientRect;
GetClientRect(clientRect);
switch (mClickedArea) {
case Area_Thumb: {
int theThumbPosition, theThumbSize;
clientRect.DeflateRect(0, 16);
CalcScrollBarThumb(&theThumbPosition, &theThumbSize);
int val = PositionToValue(clientRect) - theThumbSize;
if (val == 0)
val = 1;
ScrollBarAction(
Area_Thumb,
mMouseDownValue + ((PositionToValue(pt) - PositionToValue(mMouseDownPoint)) * (mRange - mPage)) / val
);
break;
}
case Area_Up: {
CRect buttonArea;
GetUpButtonRect(clientRect, buttonArea);
BOOL mouseInRect = buttonArea.PtInRect(pt);
if (mouseInRect != m74) {
m74 = mouseInRect;
mUpImage = m74 ? 100 : 0;
InvalidateRect(buttonArea);
}
break;
}
case Area_Down: {
CRect buttonArea;
GetDnButtonRect(clientRect, buttonArea);
BOOL mouseInRect = buttonArea.PtInRect(pt);
if (mouseInRect != m74) {
m74 = mouseInRect;
mDownImage = m74 ? 100 : 0;
InvalidateRect(buttonArea);
}
break;
}
}
}
}
void T2DlgItemScr::CalcScrollBarThumb(int* thumbPosition, int* thumbSize) const {
if (!IsScrollable()) {
*thumbPosition = 16;
*thumbSize = 0;
} else {
CRect clientRect;
GetClientRect(clientRect);
int value = PositionToValue(clientRect);
value -= 32;
*thumbSize = (value * mPage) / mRange;
if (*thumbSize < 10)
*thumbSize = 10;
*thumbPosition = (((value - *thumbSize) * mValue) / (mRange - mPage)) + 16;
}
}
void T2DlgItemScr::ScrollBarAction(int area, int arg) {
if (!IsScrollable()) {
mValue = 0;
} else {
switch (area) {
case Area_Up:
mValue--;
break;
case Area_PageUp:
mValue -= mPage / 2;
break;
case Area_Thumb:
mValue = arg;
break;
case Area_PageDown:
mValue += mPage / 2;
break;
case Area_Down:
mValue++;
break;
}
if (mValue < 0)
mValue = 0;
if ((mRange - mPage) <= mValue)
mValue = mRange - mPage;
}
Invalidate();
Notify(GetDlgCtrlID(), 0, &mValue);
}
BOOL T2DlgItemScr::IsScrollable() const {
return (mRange > 0) && (mPage < mRange);
}
/*virtual*/ void T2DlgItemScr::OnT2Timer(UINT id) {
if (id == mTimerID && m74 && (mClickedArea == Area_Up || mClickedArea == Area_Down))
ScrollBarAction(mClickedArea, 0);
}
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