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tableview.go
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tableview.go
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// Copyright 2011 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
import (
"encoding/json"
"fmt"
"math/big"
"reflect"
"syscall"
"time"
"unsafe"
"github.com/lxn/win"
)
const tableViewWindowClass = `\o/ Walk_TableView_Class \o/`
var (
white = win.COLORREF(RGB(255, 255, 255))
checkmark = string([]byte{0xE2, 0x9C, 0x94})
tableViewFrozenLVWndProcPtr uintptr
tableViewNormalLVWndProcPtr uintptr
tableViewHdrWndProcPtr uintptr
)
func init() {
AppendToWalkInit(func() {
MustRegisterWindowClass(tableViewWindowClass)
tableViewFrozenLVWndProcPtr = syscall.NewCallback(tableViewFrozenLVWndProc)
tableViewNormalLVWndProcPtr = syscall.NewCallback(tableViewNormalLVWndProc)
tableViewHdrWndProcPtr = syscall.NewCallback(tableViewHdrWndProc)
})
}
const (
tableViewCurrentIndexChangedTimerId = 1 + iota
tableViewSelectedIndexesChangedTimerId
)
type TableViewCfg struct {
Style uint32
CustomHeaderHeight int // in native pixels?
CustomRowHeight int // in native pixels?
LayoutItem func() LayoutItem
}
// TableView is a model based widget for record centric, tabular data.
//
// TableView is implemented as a virtual mode list view to support quite large
// amounts of data.
type TableView struct {
WidgetBase
hwndFrozenLV win.HWND
hwndFrozenHdr win.HWND
frozenLVOrigWndProcPtr uintptr
frozenHdrOrigWndProcPtr uintptr
hwndNormalLV win.HWND
hwndNormalHdr win.HWND
normalLVOrigWndProcPtr uintptr
normalHdrOrigWndProcPtr uintptr
state *tableViewState
columns *TableViewColumnList
model TableModel
providedModel interface{}
itemChecker ItemChecker
imageProvider ImageProvider
styler CellStyler
style CellStyle
itemFont *Font
hIml win.HIMAGELIST
usingSysIml bool
imageUintptr2Index map[uintptr]int32
filePath2IconIndex map[string]int32
rowsResetHandlerHandle int
rowChangedHandlerHandle int
rowsChangedHandlerHandle int
rowsInsertedHandlerHandle int
rowsRemovedHandlerHandle int
sortChangedHandlerHandle int
selectedIndexes []int
prevIndex int
currentIndex int
itemIndexOfLastMouseButtonDown int
hwndItemChanged win.HWND
currentIndexChangedPublisher EventPublisher
selectedIndexesChangedPublisher EventPublisher
itemActivatedPublisher EventPublisher
columnClickedPublisher IntEventPublisher
columnsOrderableChangedPublisher EventPublisher
columnsSizableChangedPublisher EventPublisher
itemCountChangedPublisher EventPublisher
publishNextSelClear bool
inSetSelectedIndexes bool
lastColumnStretched bool
persistent bool
itemStateChangedEventDelay int
themeNormalBGColor Color
themeNormalTextColor Color
themeSelectedBGColor Color
themeSelectedTextColor Color
themeSelectedNotFocusedBGColor Color
itemBGColor Color
itemTextColor Color
alternatingRowBGColor Color
alternatingRowTextColor Color
alternatingRowBG bool
delayedCurrentIndexChangedCanceled bool
sortedColumnIndex int
sortOrder SortOrder
formActivatingHandle int
customHeaderHeight int // in native pixels?
customRowHeight int // in native pixels?
dpiOfPrevStretchLastColumn int
scrolling bool
inSetCurrentIndex bool
inMouseEvent bool
hasFrozenColumn bool
busyStretchingLastColumn bool
focused bool
ignoreNowhere bool
updateLVSizesNeedsSpecialCare bool
scrollbarOrientation Orientation
currentItemChangedPublisher EventPublisher
currentItemID interface{}
restoringCurrentItemOnReset bool
layoutItem func() LayoutItem
}
// NewTableView creates and returns a *TableView as child of the specified
// Container.
func NewTableView(parent Container) (*TableView, error) {
return NewTableViewWithStyle(parent, win.LVS_SHOWSELALWAYS)
}
// NewTableViewWithStyle creates and returns a *TableView as child of the specified
// Container and with the provided additional style bits set.
func NewTableViewWithStyle(parent Container, style uint32) (*TableView, error) {
return NewTableViewWithCfg(parent, &TableViewCfg{Style: style})
}
// NewTableViewWithCfg creates and returns a *TableView as child of the specified
// Container and with the provided additional configuration.
func NewTableViewWithCfg(parent Container, cfg *TableViewCfg) (*TableView, error) {
tv := &TableView{
imageUintptr2Index: make(map[uintptr]int32),
filePath2IconIndex: make(map[string]int32),
formActivatingHandle: -1,
customHeaderHeight: cfg.CustomHeaderHeight,
customRowHeight: cfg.CustomRowHeight,
scrollbarOrientation: Horizontal | Vertical,
restoringCurrentItemOnReset: true,
layoutItem: cfg.LayoutItem,
}
tv.columns = newTableViewColumnList(tv)
if err := InitWidget(
tv,
parent,
tableViewWindowClass,
win.WS_BORDER|win.WS_VISIBLE,
win.WS_EX_CONTROLPARENT); err != nil {
return nil, err
}
succeeded := false
defer func() {
if !succeeded {
tv.Dispose()
}
}()
var rowHeightStyle uint32
if cfg.CustomRowHeight > 0 {
rowHeightStyle = win.LVS_OWNERDRAWFIXED
}
if tv.hwndFrozenLV = win.CreateWindowEx(
0,
syscall.StringToUTF16Ptr("SysListView32"),
nil,
win.WS_CHILD|win.WS_CLIPSIBLINGS|win.WS_TABSTOP|win.WS_VISIBLE|win.LVS_OWNERDATA|win.LVS_REPORT|cfg.Style|rowHeightStyle,
win.CW_USEDEFAULT,
win.CW_USEDEFAULT,
win.CW_USEDEFAULT,
win.CW_USEDEFAULT,
tv.hWnd,
0,
0,
nil,
); tv.hwndFrozenLV == 0 {
return nil, newError("creating frozen lv failed")
}
tv.frozenLVOrigWndProcPtr = win.SetWindowLongPtr(tv.hwndFrozenLV, win.GWLP_WNDPROC, tableViewFrozenLVWndProcPtr)
if tv.frozenLVOrigWndProcPtr == 0 {
return nil, lastError("SetWindowLongPtr")
}
tv.hwndFrozenHdr = win.HWND(win.SendMessage(tv.hwndFrozenLV, win.LVM_GETHEADER, 0, 0))
tv.frozenHdrOrigWndProcPtr = win.SetWindowLongPtr(tv.hwndFrozenHdr, win.GWLP_WNDPROC, tableViewHdrWndProcPtr)
if tv.frozenHdrOrigWndProcPtr == 0 {
return nil, lastError("SetWindowLongPtr")
}
if tv.hwndNormalLV = win.CreateWindowEx(
0,
syscall.StringToUTF16Ptr("SysListView32"),
nil,
win.WS_CHILD|win.WS_CLIPSIBLINGS|win.WS_TABSTOP|win.WS_VISIBLE|win.LVS_OWNERDATA|win.LVS_REPORT|cfg.Style|rowHeightStyle,
win.CW_USEDEFAULT,
win.CW_USEDEFAULT,
win.CW_USEDEFAULT,
win.CW_USEDEFAULT,
tv.hWnd,
0,
0,
nil,
); tv.hwndNormalLV == 0 {
return nil, newError("creating normal lv failed")
}
tv.normalLVOrigWndProcPtr = win.SetWindowLongPtr(tv.hwndNormalLV, win.GWLP_WNDPROC, tableViewNormalLVWndProcPtr)
if tv.normalLVOrigWndProcPtr == 0 {
return nil, lastError("SetWindowLongPtr")
}
tv.hwndNormalHdr = win.HWND(win.SendMessage(tv.hwndNormalLV, win.LVM_GETHEADER, 0, 0))
tv.normalHdrOrigWndProcPtr = win.SetWindowLongPtr(tv.hwndNormalHdr, win.GWLP_WNDPROC, tableViewHdrWndProcPtr)
if tv.normalHdrOrigWndProcPtr == 0 {
return nil, lastError("SetWindowLongPtr")
}
tv.SetPersistent(true)
exStyle := win.SendMessage(tv.hwndFrozenLV, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)
exStyle |= win.LVS_EX_DOUBLEBUFFER | win.LVS_EX_FULLROWSELECT | win.LVS_EX_HEADERDRAGDROP | win.LVS_EX_LABELTIP | win.LVS_EX_SUBITEMIMAGES
win.SendMessage(tv.hwndFrozenLV, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
win.SendMessage(tv.hwndNormalLV, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
if hr := win.SetWindowTheme(tv.hwndFrozenLV, syscall.StringToUTF16Ptr("Explorer"), nil); win.FAILED(hr) {
return nil, errorFromHRESULT("SetWindowTheme", hr)
}
if hr := win.SetWindowTheme(tv.hwndNormalLV, syscall.StringToUTF16Ptr("Explorer"), nil); win.FAILED(hr) {
return nil, errorFromHRESULT("SetWindowTheme", hr)
}
win.SendMessage(tv.hwndFrozenLV, win.WM_CHANGEUISTATE, uintptr(win.MAKELONG(win.UIS_SET, win.UISF_HIDEFOCUS)), 0)
win.SendMessage(tv.hwndNormalLV, win.WM_CHANGEUISTATE, uintptr(win.MAKELONG(win.UIS_SET, win.UISF_HIDEFOCUS)), 0)
tv.group.toolTip.addTool(tv.hwndFrozenHdr, false)
tv.group.toolTip.addTool(tv.hwndNormalHdr, false)
tv.applyFont(parent.Font())
tv.style.dpi = tv.DPI()
tv.ApplySysColors()
tv.currentIndex = -1
tv.GraphicsEffects().Add(InteractionEffect)
tv.GraphicsEffects().Add(FocusEffect)
tv.MustRegisterProperty("ColumnsOrderable", NewBoolProperty(
func() bool {
return tv.ColumnsOrderable()
},
func(b bool) error {
tv.SetColumnsOrderable(b)
return nil
},
tv.columnsOrderableChangedPublisher.Event()))
tv.MustRegisterProperty("ColumnsSizable", NewBoolProperty(
func() bool {
return tv.ColumnsSizable()
},
func(b bool) error {
return tv.SetColumnsSizable(b)
},
tv.columnsSizableChangedPublisher.Event()))
tv.MustRegisterProperty("CurrentIndex", NewProperty(
func() interface{} {
return tv.CurrentIndex()
},
func(v interface{}) error {
return tv.SetCurrentIndex(assertIntOr(v, -1))
},
tv.CurrentIndexChanged()))
tv.MustRegisterProperty("CurrentItem", NewReadOnlyProperty(
func() interface{} {
if i := tv.CurrentIndex(); i > -1 {
if rm, ok := tv.providedModel.(reflectModel); ok {
return reflect.ValueOf(rm.Items()).Index(i).Interface()
}
}
return nil
},
tv.CurrentIndexChanged()))
tv.MustRegisterProperty("HasCurrentItem", NewReadOnlyBoolProperty(
func() bool {
return tv.CurrentIndex() != -1
},
tv.CurrentIndexChanged()))
tv.MustRegisterProperty("ItemCount", NewReadOnlyProperty(
func() interface{} {
if tv.model == nil {
return 0
}
return tv.model.RowCount()
},
tv.itemCountChangedPublisher.Event()))
tv.MustRegisterProperty("SelectedCount", NewReadOnlyProperty(
func() interface{} {
return len(tv.selectedIndexes)
},
tv.SelectedIndexesChanged()))
succeeded = true
return tv, nil
}
func (tv *TableView) asTableView() *TableView {
return tv
}
// Dispose releases the operating system resources, associated with the
// *TableView.
func (tv *TableView) Dispose() {
tv.columns.unsetColumnsTV()
tv.disposeImageListAndCaches()
if tv.hWnd != 0 {
if !win.KillTimer(tv.hWnd, tableViewCurrentIndexChangedTimerId) {
lastError("KillTimer")
}
if !win.KillTimer(tv.hWnd, tableViewSelectedIndexesChangedTimerId) {
lastError("KillTimer")
}
}
if tv.hwndFrozenLV != 0 {
tv.group.toolTip.removeTool(tv.hwndFrozenHdr)
win.DestroyWindow(tv.hwndFrozenLV)
tv.hwndFrozenLV = 0
}
if tv.hwndNormalLV != 0 {
tv.group.toolTip.removeTool(tv.hwndNormalHdr)
win.DestroyWindow(tv.hwndNormalLV)
tv.hwndNormalLV = 0
}
if tv.formActivatingHandle > -1 {
if form := tv.Form(); form != nil {
form.Activating().Detach(tv.formActivatingHandle)
}
tv.formActivatingHandle = -1
}
tv.WidgetBase.Dispose()
}
func (tv *TableView) applyEnabled(enabled bool) {
tv.WidgetBase.applyEnabled(enabled)
win.EnableWindow(tv.hwndFrozenLV, enabled)
win.EnableWindow(tv.hwndNormalLV, enabled)
}
func (tv *TableView) applyFont(font *Font) {
if tv.customHeaderHeight > 0 || tv.customRowHeight > 0 {
return
}
tv.WidgetBase.applyFont(font)
hFont := uintptr(font.handleForDPI(tv.DPI()))
win.SendMessage(tv.hwndFrozenLV, win.WM_SETFONT, hFont, 0)
win.SendMessage(tv.hwndNormalLV, win.WM_SETFONT, hFont, 0)
}
func (tv *TableView) ApplyDPI(dpi int) {
tv.style.dpi = dpi
if tv.style.canvas != nil {
tv.style.canvas.dpi = dpi
}
tv.WidgetBase.ApplyDPI(dpi)
for _, column := range tv.columns.items {
column.update()
}
if tv.hIml != 0 {
tv.disposeImageListAndCaches()
if bmp, err := NewBitmapForDPI(SizeFrom96DPI(Size{16, 16}, dpi), dpi); err == nil {
tv.applyImageListForImage(bmp)
bmp.Dispose()
}
}
}
func (tv *TableView) ApplySysColors() {
tv.WidgetBase.ApplySysColors()
// As some combinations of property and state may be invalid for any theme,
// we set some defaults here.
tv.themeNormalBGColor = Color(win.GetSysColor(win.COLOR_WINDOW))
tv.themeNormalTextColor = Color(win.GetSysColor(win.COLOR_WINDOWTEXT))
tv.themeSelectedBGColor = tv.themeNormalBGColor
tv.themeSelectedTextColor = tv.themeNormalTextColor
tv.themeSelectedNotFocusedBGColor = tv.themeNormalBGColor
tv.alternatingRowBGColor = Color(win.GetSysColor(win.COLOR_BTNFACE))
tv.alternatingRowTextColor = Color(win.GetSysColor(win.COLOR_BTNTEXT))
type item struct {
stateID int32
propertyID int32
color *Color
}
getThemeColor := func(theme win.HTHEME, partId int32, items []item) {
for _, item := range items {
var c win.COLORREF
if result := win.GetThemeColor(theme, partId, item.stateID, item.propertyID, &c); !win.FAILED(result) {
(*item.color) = Color(c)
}
}
}
if hThemeListView := win.OpenThemeData(tv.hwndNormalLV, syscall.StringToUTF16Ptr("Listview")); hThemeListView != 0 {
defer win.CloseThemeData(hThemeListView)
getThemeColor(hThemeListView, win.LVP_LISTITEM, []item{
{win.LISS_NORMAL, win.TMT_FILLCOLOR, &tv.themeNormalBGColor},
{win.LISS_NORMAL, win.TMT_TEXTCOLOR, &tv.themeNormalTextColor},
{win.LISS_SELECTED, win.TMT_FILLCOLOR, &tv.themeSelectedBGColor},
{win.LISS_SELECTED, win.TMT_TEXTCOLOR, &tv.themeSelectedTextColor},
{win.LISS_SELECTEDNOTFOCUS, win.TMT_FILLCOLOR, &tv.themeSelectedNotFocusedBGColor},
})
} else {
// The others already have been retrieved above.
tv.themeSelectedBGColor = Color(win.GetSysColor(win.COLOR_HIGHLIGHT))
tv.themeSelectedTextColor = Color(win.GetSysColor(win.COLOR_HIGHLIGHTTEXT))
tv.themeSelectedNotFocusedBGColor = Color(win.GetSysColor(win.COLOR_BTNFACE))
}
if hThemeButton := win.OpenThemeData(tv.hwndNormalLV, syscall.StringToUTF16Ptr("BUTTON")); hThemeButton != 0 {
defer win.CloseThemeData(hThemeButton)
getThemeColor(hThemeButton, win.BP_PUSHBUTTON, []item{
{win.PBS_NORMAL, win.TMT_FILLCOLOR, &tv.alternatingRowBGColor},
{win.PBS_NORMAL, win.TMT_TEXTCOLOR, &tv.alternatingRowTextColor},
})
}
win.SendMessage(tv.hwndNormalLV, win.LVM_SETBKCOLOR, 0, uintptr(tv.themeNormalBGColor))
win.SendMessage(tv.hwndFrozenLV, win.LVM_SETBKCOLOR, 0, uintptr(tv.themeNormalBGColor))
}
// ColumnsOrderable returns if the user can reorder columns by dragging and
// dropping column headers.
func (tv *TableView) ColumnsOrderable() bool {
exStyle := win.SendMessage(tv.hwndNormalLV, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)
return exStyle&win.LVS_EX_HEADERDRAGDROP > 0
}
// SetColumnsOrderable sets if the user can reorder columns by dragging and
// dropping column headers.
func (tv *TableView) SetColumnsOrderable(enabled bool) {
var hwnd win.HWND
if tv.hasFrozenColumn {
hwnd = tv.hwndFrozenLV
} else {
hwnd = tv.hwndNormalLV
}
exStyle := win.SendMessage(hwnd, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)
if enabled {
exStyle |= win.LVS_EX_HEADERDRAGDROP
} else {
exStyle &^= win.LVS_EX_HEADERDRAGDROP
}
win.SendMessage(tv.hwndFrozenLV, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
win.SendMessage(tv.hwndNormalLV, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
tv.columnsOrderableChangedPublisher.Publish()
}
// ColumnsSizable returns if the user can change column widths by dragging
// dividers in the header.
func (tv *TableView) ColumnsSizable() bool {
style := win.GetWindowLong(tv.hwndNormalHdr, win.GWL_STYLE)
return style&win.HDS_NOSIZING == 0
}
// SetColumnsSizable sets if the user can change column widths by dragging
// dividers in the header.
func (tv *TableView) SetColumnsSizable(b bool) error {
updateStyle := func(headerHWnd win.HWND) error {
style := win.GetWindowLong(headerHWnd, win.GWL_STYLE)
if b {
style &^= win.HDS_NOSIZING
} else {
style |= win.HDS_NOSIZING
}
if 0 == win.SetWindowLong(headerHWnd, win.GWL_STYLE, style) {
return lastError("SetWindowLong(GWL_STYLE)")
}
return nil
}
if err := updateStyle(tv.hwndFrozenHdr); err != nil {
return err
}
if err := updateStyle(tv.hwndNormalHdr); err != nil {
return err
}
tv.columnsSizableChangedPublisher.Publish()
return nil
}
// ContextMenuLocation returns selected item position in screen coordinates in native pixels.
func (tv *TableView) ContextMenuLocation() Point {
idx := win.SendMessage(tv.hwndNormalLV, win.LVM_GETSELECTIONMARK, 0, 0)
rc := win.RECT{Left: win.LVIR_BOUNDS}
if 0 == win.SendMessage(tv.hwndNormalLV, win.LVM_GETITEMRECT, idx, uintptr(unsafe.Pointer(&rc))) {
return tv.WidgetBase.ContextMenuLocation()
}
var pt win.POINT
if tv.RightToLeftReading() {
pt.X = rc.Right
} else {
pt.X = rc.Left
}
pt.X = rc.Bottom
windowTrimToClientBounds(tv.hwndNormalLV, &pt)
win.ClientToScreen(tv.hwndNormalLV, &pt)
return pointPixelsFromPOINT(pt)
}
// SortableByHeaderClick returns if the user can change sorting by clicking the header.
func (tv *TableView) SortableByHeaderClick() bool {
return !hasWindowLongBits(tv.hwndFrozenLV, win.GWL_STYLE, win.LVS_NOSORTHEADER) ||
!hasWindowLongBits(tv.hwndNormalLV, win.GWL_STYLE, win.LVS_NOSORTHEADER)
}
// HeaderHidden returns whether the column header is hidden.
func (tv *TableView) HeaderHidden() bool {
style := win.GetWindowLong(tv.hwndNormalLV, win.GWL_STYLE)
return style&win.LVS_NOCOLUMNHEADER != 0
}
// SetHeaderHidden sets whether the column header is hidden.
func (tv *TableView) SetHeaderHidden(hidden bool) error {
if err := ensureWindowLongBits(tv.hwndFrozenLV, win.GWL_STYLE, win.LVS_NOCOLUMNHEADER, hidden); err != nil {
return err
}
return ensureWindowLongBits(tv.hwndNormalLV, win.GWL_STYLE, win.LVS_NOCOLUMNHEADER, hidden)
}
// AlternatingRowBG returns the alternating row background.
func (tv *TableView) AlternatingRowBG() bool {
return tv.alternatingRowBG
}
// SetAlternatingRowBG sets the alternating row background.
func (tv *TableView) SetAlternatingRowBG(enabled bool) {
tv.alternatingRowBG = enabled
tv.Invalidate()
}
// Gridlines returns if the rows are separated by grid lines.
func (tv *TableView) Gridlines() bool {
exStyle := win.SendMessage(tv.hwndNormalLV, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)
return exStyle&win.LVS_EX_GRIDLINES > 0
}
// SetGridlines sets if the rows are separated by grid lines.
func (tv *TableView) SetGridlines(enabled bool) {
var hwnd win.HWND
if tv.hasFrozenColumn {
hwnd = tv.hwndFrozenLV
} else {
hwnd = tv.hwndNormalLV
}
exStyle := win.SendMessage(hwnd, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)
if enabled {
exStyle |= win.LVS_EX_GRIDLINES
} else {
exStyle &^= win.LVS_EX_GRIDLINES
}
win.SendMessage(tv.hwndFrozenLV, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
win.SendMessage(tv.hwndNormalLV, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
}
// Columns returns the list of columns.
func (tv *TableView) Columns() *TableViewColumnList {
return tv.columns
}
// VisibleColumnsInDisplayOrder returns a slice of visible columns in display
// order.
func (tv *TableView) VisibleColumnsInDisplayOrder() []*TableViewColumn {
visibleCols := tv.visibleColumns()
indices := make([]int32, len(visibleCols))
frozenCount := tv.visibleFrozenColumnCount()
normalCount := len(visibleCols) - frozenCount
if frozenCount > 0 {
if win.FALSE == win.SendMessage(tv.hwndFrozenLV, win.LVM_GETCOLUMNORDERARRAY, uintptr(frozenCount), uintptr(unsafe.Pointer(&indices[0]))) {
newError("LVM_GETCOLUMNORDERARRAY")
return nil
}
}
if normalCount > 0 {
if win.FALSE == win.SendMessage(tv.hwndNormalLV, win.LVM_GETCOLUMNORDERARRAY, uintptr(normalCount), uintptr(unsafe.Pointer(&indices[frozenCount]))) {
newError("LVM_GETCOLUMNORDERARRAY")
return nil
}
}
orderedCols := make([]*TableViewColumn, len(visibleCols))
for i, j := range indices {
if i >= frozenCount {
j += int32(frozenCount)
}
orderedCols[i] = visibleCols[j]
}
return orderedCols
}
// RowsPerPage returns the number of fully visible rows.
func (tv *TableView) RowsPerPage() int {
return int(win.SendMessage(tv.hwndNormalLV, win.LVM_GETCOUNTPERPAGE, 0, 0))
}
func (tv *TableView) Invalidate() error {
win.InvalidateRect(tv.hwndFrozenLV, nil, true)
win.InvalidateRect(tv.hwndNormalLV, nil, true)
return tv.WidgetBase.Invalidate()
}
func (tv *TableView) redrawItems() {
first := win.SendMessage(tv.hwndNormalLV, win.LVM_GETTOPINDEX, 0, 0)
last := first + win.SendMessage(tv.hwndNormalLV, win.LVM_GETCOUNTPERPAGE, 0, 0) + 1
win.SendMessage(tv.hwndFrozenLV, win.LVM_REDRAWITEMS, first, last)
win.SendMessage(tv.hwndNormalLV, win.LVM_REDRAWITEMS, first, last)
}
// UpdateItem ensures the item at index will be redrawn.
//
// If the model supports sorting, it will be resorted.
func (tv *TableView) UpdateItem(index int) error {
if s, ok := tv.model.(Sorter); ok {
if err := s.Sort(s.SortedColumn(), s.SortOrder()); err != nil {
return err
}
} else {
if win.FALSE == win.SendMessage(tv.hwndFrozenLV, win.LVM_UPDATE, uintptr(index), 0) {
return newError("LVM_UPDATE")
}
if win.FALSE == win.SendMessage(tv.hwndNormalLV, win.LVM_UPDATE, uintptr(index), 0) {
return newError("LVM_UPDATE")
}
}
return nil
}
func (tv *TableView) attachModel() {
restoreCurrentItemOrFallbackToFirst := func(ip IDProvider) {
if tv.itemStateChangedEventDelay == 0 {
defer tv.currentItemChangedPublisher.Publish()
} else {
if 0 == win.SetTimer(
tv.hWnd,
tableViewCurrentIndexChangedTimerId,
uint32(tv.itemStateChangedEventDelay),
0,
) {
lastError("SetTimer")
}
}
count := tv.model.RowCount()
for i := 0; i < count; i++ {
if ip.ID(i) == tv.currentItemID {
tv.SetCurrentIndex(i)
return
}
}
tv.SetCurrentIndex(0)
}
tv.rowsResetHandlerHandle = tv.model.RowsReset().Attach(func() {
tv.setItemCount()
if ip, ok := tv.providedModel.(IDProvider); ok && tv.restoringCurrentItemOnReset {
if _, ok := tv.model.(Sorter); !ok {
restoreCurrentItemOrFallbackToFirst(ip)
}
} else {
tv.SetCurrentIndex(-1)
}
tv.itemCountChangedPublisher.Publish()
})
tv.rowChangedHandlerHandle = tv.model.RowChanged().Attach(func(row int) {
tv.UpdateItem(row)
})
tv.rowsChangedHandlerHandle = tv.model.RowsChanged().Attach(func(from, to int) {
if s, ok := tv.model.(Sorter); ok {
s.Sort(s.SortedColumn(), s.SortOrder())
} else {
first, last := uintptr(from), uintptr(to)
win.SendMessage(tv.hwndFrozenLV, win.LVM_REDRAWITEMS, first, last)
win.SendMessage(tv.hwndNormalLV, win.LVM_REDRAWITEMS, first, last)
}
})
tv.rowsInsertedHandlerHandle = tv.model.RowsInserted().Attach(func(from, to int) {
i := tv.currentIndex
tv.setItemCount()
if from <= i {
i += 1 + to - from
tv.SetCurrentIndex(i)
}
tv.itemCountChangedPublisher.Publish()
})
tv.rowsRemovedHandlerHandle = tv.model.RowsRemoved().Attach(func(from, to int) {
i := tv.currentIndex
tv.setItemCount()
index := i
if from <= i && i <= to {
index = -1
} else if from < i {
index -= 1 + to - from
}
if index != i {
tv.SetCurrentIndex(index)
}
tv.itemCountChangedPublisher.Publish()
})
if sorter, ok := tv.model.(Sorter); ok {
tv.sortChangedHandlerHandle = sorter.SortChanged().Attach(func() {
if ip, ok := tv.providedModel.(IDProvider); ok && tv.restoringCurrentItemOnReset {
restoreCurrentItemOrFallbackToFirst(ip)
}
col := sorter.SortedColumn()
tv.setSortIcon(col, sorter.SortOrder())
tv.redrawItems()
})
}
}
func (tv *TableView) detachModel() {
tv.model.RowsReset().Detach(tv.rowsResetHandlerHandle)
tv.model.RowChanged().Detach(tv.rowChangedHandlerHandle)
tv.model.RowsInserted().Detach(tv.rowsInsertedHandlerHandle)
tv.model.RowsRemoved().Detach(tv.rowsRemovedHandlerHandle)
if sorter, ok := tv.model.(Sorter); ok {
sorter.SortChanged().Detach(tv.sortChangedHandlerHandle)
}
}
// ItemCountChanged returns the event that is published when the number of items
// in the model of the TableView changed.
func (tv *TableView) ItemCountChanged() *Event {
return tv.itemCountChangedPublisher.Event()
}
// Model returns the model of the TableView.
func (tv *TableView) Model() interface{} {
return tv.providedModel
}
// SetModel sets the model of the TableView.
//
// It is required that mdl either implements walk.TableModel,
// walk.ReflectTableModel or be a slice of pointers to struct or a
// []map[string]interface{}. A walk.TableModel implementation must also
// implement walk.Sorter to support sorting, all other options get sorting for
// free. To support item check boxes and icons, mdl must implement
// walk.ItemChecker and walk.ImageProvider, respectively. On-demand model
// population for a walk.ReflectTableModel or slice requires mdl to implement
// walk.Populator.
func (tv *TableView) SetModel(mdl interface{}) error {
model, ok := mdl.(TableModel)
if !ok && mdl != nil {
var err error
if model, err = newReflectTableModel(mdl); err != nil {
if model, err = newMapTableModel(mdl); err != nil {
return err
}
}
}
tv.SetSuspended(true)
defer tv.SetSuspended(false)
if tv.model != nil {
tv.detachModel()
tv.disposeImageListAndCaches()
}
oldProvidedModelStyler, _ := tv.providedModel.(CellStyler)
if styler, ok := mdl.(CellStyler); ok || tv.styler == oldProvidedModelStyler {
tv.styler = styler
}
tv.providedModel = mdl
tv.model = model
tv.itemChecker, _ = model.(ItemChecker)
tv.imageProvider, _ = model.(ImageProvider)
if model != nil {
tv.attachModel()
if dms, ok := model.(dataMembersSetter); ok {
// FIXME: This depends on columns to be initialized before
// calling this method.
dataMembers := make([]string, len(tv.columns.items))
for i, col := range tv.columns.items {
dataMembers[i] = col.DataMemberEffective()
}
dms.setDataMembers(dataMembers)
}
if lfs, ok := model.(lessFuncsSetter); ok {
lessFuncs := make([]func(i, j int) bool, tv.columns.Len())
for i, c := range tv.columns.items {
lessFuncs[i] = c.lessFunc
}
lfs.setLessFuncs(lessFuncs)
}
if sorter, ok := tv.model.(Sorter); ok {
if tv.sortedColumnIndex >= tv.visibleColumnCount() {
tv.sortedColumnIndex = maxi(-1, mini(0, tv.visibleColumnCount()-1))
tv.sortOrder = SortAscending
}
sorter.Sort(tv.sortedColumnIndex, tv.sortOrder)
}
}
tv.SetCurrentIndex(-1)
tv.setItemCount()
tv.itemCountChangedPublisher.Publish()
return nil
}
// TableModel returns the TableModel of the TableView.
func (tv *TableView) TableModel() TableModel {
return tv.model
}
// ItemChecker returns the ItemChecker of the TableView.
func (tv *TableView) ItemChecker() ItemChecker {
return tv.itemChecker
}
// SetItemChecker sets the ItemChecker of the TableView.
func (tv *TableView) SetItemChecker(itemChecker ItemChecker) {
tv.itemChecker = itemChecker
}
// CellStyler returns the CellStyler of the TableView.
func (tv *TableView) CellStyler() CellStyler {
return tv.styler
}
// SetCellStyler sets the CellStyler of the TableView.
func (tv *TableView) SetCellStyler(styler CellStyler) {
tv.styler = styler
}
func (tv *TableView) setItemCount() error {
var count int
if tv.model != nil {
count = tv.model.RowCount()
}
if 0 == win.SendMessage(tv.hwndFrozenLV, win.LVM_SETITEMCOUNT, uintptr(count), win.LVSICF_NOINVALIDATEALL|win.LVSICF_NOSCROLL) {
return newError("SendMessage(LVM_SETITEMCOUNT)")
}
if 0 == win.SendMessage(tv.hwndNormalLV, win.LVM_SETITEMCOUNT, uintptr(count), win.LVSICF_NOINVALIDATEALL|win.LVSICF_NOSCROLL) {
return newError("SendMessage(LVM_SETITEMCOUNT)")
}
return nil
}
// CheckBoxes returns if the *TableView has check boxes.
func (tv *TableView) CheckBoxes() bool {
var hwnd win.HWND
if tv.hasFrozenColumn {
hwnd = tv.hwndFrozenLV
} else {
hwnd = tv.hwndNormalLV
}
return win.SendMessage(hwnd, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)&win.LVS_EX_CHECKBOXES > 0
}
// SetCheckBoxes sets if the *TableView has check boxes.
func (tv *TableView) SetCheckBoxes(checkBoxes bool) {
var hwnd, hwndOther win.HWND
if tv.hasFrozenColumn {
hwnd, hwndOther = tv.hwndFrozenLV, tv.hwndNormalLV
} else {
hwnd, hwndOther = tv.hwndNormalLV, tv.hwndFrozenLV
}
exStyle := win.SendMessage(hwnd, win.LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0)
oldStyle := exStyle
if checkBoxes {
exStyle |= win.LVS_EX_CHECKBOXES
} else {
exStyle &^= win.LVS_EX_CHECKBOXES
}
if exStyle != oldStyle {
win.SendMessage(hwnd, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle)
}
win.SendMessage(hwndOther, win.LVM_SETEXTENDEDLISTVIEWSTYLE, 0, exStyle&^win.LVS_EX_CHECKBOXES)
mask := win.SendMessage(hwnd, win.LVM_GETCALLBACKMASK, 0, 0)
if checkBoxes {
mask |= win.LVIS_STATEIMAGEMASK
} else {
mask &^= win.LVIS_STATEIMAGEMASK
}
if win.FALSE == win.SendMessage(hwnd, win.LVM_SETCALLBACKMASK, mask, 0) {
newError("SendMessage(LVM_SETCALLBACKMASK)")
}
}
func (tv *TableView) fromLVColIdx(frozen bool, index int32) int {
var idx int32
for i, tvc := range tv.columns.items {
if frozen == tvc.frozen && tvc.visible {