void TrackBar::OnMouseMove( int mX, int mY, bool mouseState ) {
if(m_is_readonly || !canChange()) return;
const Rect& rect = GetRect();
if(mouseState) {
if(m_is_vertical) {
int y = clip(rect.h - (mY), m_slider_radius/2, rect.h - m_slider_radius/2);
if(y != m_slider_pix) {
m_slider_pix = y;
onChange();
}
} else {
int x = clip(mX, m_slider_radius/2, rect.w-m_slider_radius/2);
if(x != m_slider_pix) {
m_slider_pix = x;
onChange();
}
}
} else {
Rect sr = getSliderRect();
int x = mX - (sr.x+sr.w/2);
int y = mY - (sr.y+sr.h/2);
if(x*x + y*y < m_slider_radius*m_slider_radius) {
m_on_it = true;
return;
}
m_on_it = false;
}
}
// TODO mouse tracking -- snap back when too far away?
// Note how this never overpaints, compared with code in magazine
static void onPaint( HWND hwnd ) {
const int DFCS_HOT = 4096;
const RECT rcSlider = getSliderRect( hwnd );
const RECT rcClient = getClientRect( hwnd );
RECT rcLeft = rcClient;
if ( isVertical( hwnd ) ) {
rcLeft.bottom = rcSlider.top;
} else {
rcLeft.right = rcSlider.left;
}
RECT rcRight = rcClient;
if ( isVertical( hwnd ) ) {
rcRight.top = rcSlider.bottom;
} else {
rcRight.left = rcSlider.right;
}
const int leftColor = getHTCode( hwnd ) == htLeft ? COLOR_BTNSHADOW : getBkColor( hwnd );
const int rightColor = getHTCode( hwnd ) == htRight ? COLOR_BTNSHADOW : getBkColor( hwnd );
PAINTSTRUCT ps = { 0 };
BeginPaint( hwnd, &ps );
fillRect( ps.hdc, hwnd, &rcLeft , leftColor );
fillRect( ps.hdc, hwnd, &rcSlider, getSliderColor( hwnd ) );
fillRect( ps.hdc, hwnd, &rcRight , rightColor );
if ( isVertical( hwnd ) ) {
const int width = rcClient.right - rcClient.left;
rcLeft .top = rcLeft .bottom - width;
rcRight.bottom = rcRight.top + width;
} else {
const int height = rcClient.bottom - rcClient.top;
rcLeft .left = rcLeft .right - height;
rcRight.right = rcRight.left + height;
}
const UINT extraLeft = getHTCode( hwnd ) == htLeftSlider ? DFCS_HOT : 0;
const UINT extraRight = getHTCode( hwnd ) == htRightSlider ? DFCS_HOT : 0;
DrawFrameControl( ps.hdc, &rcLeft , DFC_SCROLL, extraLeft | (isVertical( hwnd ) ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT) );
DrawFrameControl( ps.hdc, &rcRight, DFC_SCROLL, extraRight | (isVertical( hwnd ) ? DFCS_SCROLLUP : DFCS_SCROLLLEFT ) );
EndPaint( hwnd, &ps );
}
static int hitTest( HWND hwnd, int x ) {
const RECT rc = getSliderRect( hwnd );
const int left = isVertical( hwnd ) ? rc.top : rc.left ;
const int right = isVertical( hwnd ) ? rc.bottom : rc.right;
if ( x < left - getHandle( hwnd ) ) {
return htLeft;
}
if ( x <= left ) {
return htLeftSlider;
}
if ( x < right ) {
return htSlider;
}
if ( x <= right + getHandle( hwnd ) ) {
return htRightSlider;
}
return htRight;
}
