149 lines
4.3 KiB
Go
149 lines
4.3 KiB
Go
// 28 october 2014
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package ui
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import (
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"strconv"
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"unsafe"
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)
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// #include "winapi_windows.h"
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import "C"
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// TODO do we have to manually monitor user changes to the edit control?
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// TODO WS_EX_CLIENTEDGE on the updown?
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type spinbox struct {
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hwndEdit C.HWND
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hwndUpDown C.HWND
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changed *event
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// updown state
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updownVisible bool
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// keep these here to avoid having to get them out
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value int
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min int
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max int
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}
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func newSpinbox(min int, max int) Spinbox {
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s := new(spinbox)
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s.hwndEdit = C.newControl(editclass,
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C.textfieldStyle | C.ES_NUMBER,
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C.textfieldExtStyle)
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s.changed = newEvent()
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s.updownVisible = true // initially shown
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s.min = min
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s.max = max
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s.value = s.min
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s.remakeUpDown()
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C.controlSetControlFont(s.hwndEdit)
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C.setSpinboxEditSubclass(s.hwndEdit, unsafe.Pointer(s))
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return s
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}
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func (s *spinbox) cap() {
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if s.value < s.min {
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s.value = s.min
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}
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if s.value > s.max {
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s.value = s.max
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}
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}
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func (s *spinbox) Value() int {
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return s.value
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}
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func (s *spinbox) SetValue(value int) {
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// UDM_SETPOS32 is documented to do what we want, but since we're keeping a copy of value we need to do it anyway
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s.value = value
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s.cap()
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C.SendMessageW(s.hwndUpDown, C.UDM_SETPOS32, 0, C.LPARAM(s.value))
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}
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func (s *spinbox) OnChanged(e func()) {
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s.changed.set(e)
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}
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//export spinboxUpDownClicked
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func spinboxUpDownClicked(data unsafe.Pointer, nud *C.NMUPDOWN) {
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// this is where we do custom increments
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s := (*spinbox)(data)
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s.value = int(nud.iPos + nud.iDelta)
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// this can go above or below the bounds (the spinbox only rejects invalid values after the UDN_DELTAPOS notification is processed)
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// because we have a copy of the value, we need to fix that here
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s.cap()
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s.changed.fire()
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}
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//export spinboxEditChanged
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func spinboxEditChanged(data unsafe.Pointer) {
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// we're basically on our own here
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s := (*spinbox)(unsafe.Pointer(data))
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// this basically does what OS X does: values too low get clamped to the minimum, values too high get clamped to the maximum, and deleting everything clamps to the minimum
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value, err := strconv.Atoi(getWindowText(s.hwndEdit))
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if err != nil {
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// best we can do fo rnow in this case :S
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// a partial atoi() like in C would be more optimal
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// it handles the deleting everything case just fine
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value = s.min
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}
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s.value = value
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s.cap()
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C.SendMessageW(s.hwndUpDown, C.UDM_SETPOS32, 0, C.LPARAM(s.value))
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// TODO position the insertion caret at the end (or wherever is appropriate)
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s.changed.fire()
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}
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func (s *spinbox) setParent(p *controlParent) {
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C.controlSetParent(s.hwndEdit, p.hwnd)
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C.controlSetParent(s.hwndUpDown, p.hwnd)
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}
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// an up-down control will only properly position itself the first time
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// stupidly, there are no messages to force a size calculation, nor can I seem to reset the buddy window to force a new position
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// alas, we have to make a new up/down control each time :(
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// TODO we'll need to store a copy of the current position and range for this
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func (s *spinbox) remakeUpDown() {
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// destroying the previous one, setting the parent properly, and subclassing are handled here
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s.hwndUpDown = C.newUpDown(s.hwndUpDown, unsafe.Pointer(s))
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// for this to work, hwndUpDown needs to have rect [0 0 0 0]
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C.moveWindow(s.hwndUpDown, 0, 0, 0, 0)
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C.SendMessageW(s.hwndUpDown, C.UDM_SETBUDDY, C.WPARAM(uintptr(unsafe.Pointer(s.hwndEdit))), 0)
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C.SendMessageW(s.hwndUpDown, C.UDM_SETRANGE32, C.WPARAM(s.min), C.LPARAM(s.max))
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C.SendMessageW(s.hwndUpDown, C.UDM_SETPOS32, 0, C.LPARAM(s.value))
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if s.updownVisible {
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C.ShowWindow(s.hwndUpDown, C.SW_SHOW)
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}
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}
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// use the same height as normal text fields
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// TODO constrain the width somehow
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func (s *spinbox) preferredSize(d *sizing) (width, height int) {
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return fromdlgunitsX(textfieldWidth, d), fromdlgunitsY(textfieldHeight, d)
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}
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func (s *spinbox) resize(x int, y int, width int, height int, d *sizing) {
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C.moveWindow(s.hwndEdit, C.int(x), C.int(y), C.int(width), C.int(height))
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s.remakeUpDown()
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}
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func (s *spinbox) nTabStops() int {
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// TODO does the up-down control count?
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return 1
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}
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// TODO be sure to modify this when we add Show()/Hide()
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func (s *spinbox) containerShow() {
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C.ShowWindow(s.hwndEdit, C.SW_SHOW)
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C.ShowWindow(s.hwndUpDown, C.SW_SHOW)
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s.updownVisible = true
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}
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// TODO be sure to modify this when we add Show()/Hide()
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func (s *spinbox) containerHide() {
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C.ShowWindow(s.hwndEdit, C.SW_HIDE)
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C.ShowWindow(s.hwndUpDown, C.SW_HIDE)
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s.updownVisible = false
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}
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