forked from tadvi/winc
/
scrollview.go
119 lines (92 loc) · 2.45 KB
/
scrollview.go
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/*
* Copyright (C) 2019 The Winc Authors. All Rights Reserved.
*/
package winc
import (
"unsafe"
"github.com/tadvi/winc/w32"
)
type ScrollView struct {
ControlBase
child Dockable
}
func NewScrollView(parent Controller) *ScrollView {
sv := new(ScrollView)
RegClassOnlyOnce("winc_ScrollView")
sv.hwnd = CreateWindow("winc_ScrollView", parent, w32.WS_EX_CONTROLPARENT,
w32.WS_CHILD|w32.WS_HSCROLL|w32.WS_VISIBLE|w32.WS_VSCROLL)
sv.parent = parent
RegMsgHandler(sv)
sv.SetFont(DefaultFont)
sv.SetText("")
sv.SetSize(200, 200)
return sv
}
func (sv *ScrollView) SetChild(child Dockable) {
sv.child = child
}
func (sv *ScrollView) UpdateScrollBars() {
w, h := sv.child.Width(), sv.child.Height()
sw, sh := sv.Size()
var si w32.SCROLLINFO
si.CbSize = uint32(unsafe.Sizeof(si))
si.FMask = w32.SIF_PAGE | w32.SIF_RANGE
si.NMax = int32(w - 1)
si.NPage = uint32(sw)
w32.SetScrollInfo(sv.hwnd, w32.SB_HORZ, &si, true)
x := sv.scroll(w32.SB_HORZ, w32.SB_THUMBPOSITION)
si.NMax = int32(h)
si.NPage = uint32(sh)
w32.SetScrollInfo(sv.hwnd, w32.SB_VERT, &si, true)
y := sv.scroll(w32.SB_VERT, w32.SB_THUMBPOSITION)
sv.child.SetPos(x, y)
}
func (sv *ScrollView) scroll(sb int32, cmd uint16) int {
var pos int32
var si w32.SCROLLINFO
si.CbSize = uint32(unsafe.Sizeof(si))
si.FMask = w32.SIF_PAGE | w32.SIF_POS | w32.SIF_RANGE | w32.SIF_TRACKPOS
w32.GetScrollInfo(sv.hwnd, sb, &si)
pos = si.NPos
switch cmd {
case w32.SB_LINELEFT: // == win.SB_LINEUP
pos -= 20
case w32.SB_LINERIGHT: // == win.SB_LINEDOWN
pos += 20
case w32.SB_PAGELEFT: // == win.SB_PAGEUP
pos -= int32(si.NPage)
case w32.SB_PAGERIGHT: // == win.SB_PAGEDOWN
pos += int32(si.NPage)
case w32.SB_THUMBTRACK:
pos = si.NTrackPos
}
if pos < 0 {
pos = 0
}
if pos > si.NMax+1-int32(si.NPage) {
pos = si.NMax + 1 - int32(si.NPage)
}
si.FMask = w32.SIF_POS
si.NPos = pos
w32.SetScrollInfo(sv.hwnd, sb, &si, true)
return -int(pos)
}
func (sv *ScrollView) WndProc(msg uint32, wparam, lparam uintptr) uintptr {
if sv.child != nil {
switch msg {
case w32.WM_PAINT:
sv.UpdateScrollBars()
case w32.WM_HSCROLL:
x, y := sv.child.Pos()
x = sv.scroll(w32.SB_HORZ, w32.LOWORD(uint32(wparam)))
sv.child.SetPos(x, y)
case w32.WM_VSCROLL:
x, y := sv.child.Pos()
y = sv.scroll(w32.SB_VERT, w32.LOWORD(uint32(wparam)))
sv.child.SetPos(x, y)
case w32.WM_SIZE, w32.WM_SIZING:
sv.UpdateScrollBars()
}
}
return w32.DefWindowProc(sv.hwnd, msg, wparam, lparam)
}