Am new to MFC, I want to replicate the exact Ctrl+Page Down and Ctrl+Page Up behavior to regular Page Down/Page Up keys without any supporting keys (Ctrl/Shift). I have been trying to clear the focus of item which is getting selected automatically on striking the keys Page Up and Page Down.
I've tried with this code but its not working:
case VK_NEXT: // pagedown
case VK_PRIOR: // pageup
lhItem = GetFocusedItem();
if (IsSelected(lhItem))
{
CTreeCtrl::SetItemState(lhItem, 0, TVIS_SELECTED);
}
break;
Can anyone please help me in solving it
The Code need to written in OnSelChanging & OnSelChanged Event Handler functions
void CTreeCtrl::OnSelchanging(NMHDR *pNMHDR, LRESULT *pResult)
{
HTREEITEM hNew = pNMTreeView->itemNew.hItem;
HTREEITEM hOld = pNMTreeView->itemOld.hItem;
m_bOldItemSelected = hOld && (CTreeCtrl::GetItemState(hOld, UINT(TVIS_SELECTED)) & TVIS_SELECTED);
if (GetSelectedCount() > 1)
{
if (m_bPgUpState || m_bPgDownState)
{
//Check the state of New Item
if ((pNMTreeView->itemNew.state & TVIS_SELECTED))
{
// If the item is selected, so make sure OnSelchanged()
// will "select" it !
m_bNewItemSelected = TRUE;
}
else if (!(pNMTreeView->itemNew.state & TVIS_SELECTED))
{
// The New item is not selected, so make sure OnSelchanged()
// will not "re-select" it !
m_bNewItemSelected = FALSE;
CTreeCtrl::SetItemState(hNew, UINT(~TVIS_SELECTED), UINT(TVIS_SELECTED));
}
}
}
void TreeCtrl::OnSelchanged(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
HTREEITEM itemNew = pNMTreeView->itemNew.hItem;
HTREEITEM itemOld = pNMTreeView->itemOld.hItem;
if ((m_bPgUpState || m_bPgDownState) && (GetSelectedCount() > 1)
&& (pNMTreeView->itemOld.hItem != NULL || pNMTreeView->itemNew.hItem != NULL))
{
// It had the focus so Keep selection at old item
if (itemOld && m_bOldItemSelected)
{
CTreeCtrl::SetItemState(itemOld, UINT(TVIS_SELECTED), UINT(TVIS_SELECTED));
m_bOldItemSelected = FALSE;
}
else
{
// Do-not select the item if it is not selected
CTreeCtrl::SetItemState(itemOld, UINT(~TVIS_SELECTED), UINT(TVIS_SELECTED));
}
}
In this article you'll find solution for every thing about CTreeCtrl
Full-Featured Tree Control
Related
I have this event handler in a modelless popup dialog tree control:
void CAssignHistoryDlg::OnTvnSelchangedTreeHistory(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);
if (!m_bBuildTreeMode)
{
if ((pNMTreeView->itemOld.hItem == nullptr && !m_bFirstSelChangeEvent) ||
pNMTreeView->itemOld.hItem != nullptr)
{
m_bFirstSelChangeEvent = true;
if (m_treeHistory.GetParentItem(pNMTreeView->itemNew.hItem) == nullptr)
{
// We must update the correct combo
// and associated string (in the SERVMEET_S structure)
if (m_pCombo != nullptr && m_pStrText != nullptr)
{
CString strExtractedName = ExtractName(pNMTreeView->itemNew.hItem);
m_pCombo->SetWindowText(strExtractedName);
*m_pStrText = strExtractedName;
}
GetParent()->PostMessage(UM_SM_EDITOR_SET_MODIFIED, (WPARAM)TRUE);
}
}
}
*pResult = 0;
}
What I don't understand is why once this event is triggered is that it goes in a continuous cycle.
Does anything jump out at you as wrong?
I don't know why the message seemed to be going in a continuous cycle. Maybe it was because I was inserting breakpoints or adding temporary popup message boxes to debug. Either way, I worked out the minor adjustment I needed:
void CAssignHistoryDlg::OnTvnSelchangedTreeHistory(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);
if (!m_bBuildTreeMode)
{
if ((pNMTreeView->itemOld.hItem == nullptr && !m_bFirstSelChangeEvent) ||
pNMTreeView->itemOld.hItem != nullptr)
{
m_bFirstSelChangeEvent = true;
if (m_treeHistory.GetParentItem(pNMTreeView->itemNew.hItem) == nullptr)
{
// We must update the correct combo
// and associated string (in the SERVMEET_S structure)
if (m_pCombo != nullptr && m_pStrText != nullptr)
{
CString strExtractedName = ExtractName(pNMTreeView->itemNew.hItem);
m_pCombo->SetWindowText(strExtractedName);
// Bug fix - Only set as modified if the name is different
if(*m_pStrText != strExtractedName)
GetParent()->PostMessage(UM_SM_EDITOR_SET_MODIFIED, (WPARAM)TRUE);
*m_pStrText = strExtractedName;
}
}
}
}
*pResult = 0;
}
As you can see, I have changed how and where I post the UM_SM_EDITOR_SET_MODIFIED message. This causes my application to work correctly. Previously it was always setting it as modified (multiple times). So even if you had just saved the file, it then was marked as modified again. This problem no longer happens.
In a UWP app, I am using a RichTextBlock that gets populated with some content. It has word wrapping enabled and has a max lines set so that regardless of the length of its content, it will only show a certain number of lines of rich text.
I'd like to know if there is a way to figure out what is the visible text?
So if I have:
<RichTextBlock TextWrapping="Wrap" MaxLines="2">
<RichTextBlock.Blocks>
<Paragraph>
<Paragraph.Inlines>
A bunch of runs go in here with text that are several lines
</Paragraph.Inlines>
</Paragraph>
</RichTextBlock.Blocks>
</RichTextBlock>
I'd like to know how much of the text is actually visible.
I'm trying to detect cases where the text is longer than a set number of lines and append a "... Read More" at the end of the last line (replacing the last 13 chars with "... Read More")
So I wrote some code to get the behavior that I want, but unfortunately this is rather slow and inefficient. So if you're using it in an app that is primarily to show a lot of text that needs to be truncated (like a ListView with a lot of text items) then this would slow down your app perf. I still would like to know if there is a better way to do this.
Here's my code (which only handles Run and Hyperlink inlines so you'll have to modify to handle other types that you need):
private static void TrimText_Slow(RichTextBlock rtb)
{
var paragraph = rtb?.Blocks?.FirstOrDefault() as Paragraph;
if (paragraph == null) { return; }
// Ensure RichTextBlock has passed a measure step so that its HasOverflowContent is updated.
rtb.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
if (rtb.HasOverflowContent == false) { return; }
// Start from end and remove all inlines that are not visible
Inline lastInline = null;
var idx = paragraph.Inlines.Count - 1;
while (idx >= 0 && rtb.HasOverflowContent)
{
lastInline = paragraph.Inlines[idx];
paragraph.Inlines.Remove(lastInline);
idx--;
// Ensure RichTextBlock has passed a measure step now with an inline removed, so that its HasOverflowContent is updated.
rtb.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
}
// The last inline could be partially visible. The easiest thing to do here is to always
// add back the last inline and then remove characters from it until everything is in view.
if (lastInline != null)
{
paragraph.Inlines.Add(lastInline);
}
// Make room to insert "... Read More"
DeleteCharactersFromEnd(paragraph.Inlines, 13);
// Insert "... Continue Reading"
paragraph.Inlines.Add(new Run { Text = "... " });
paragraph.Inlines.Add(new Run { Text = "Read More", Foreground = new SolidColorBrush(Colors.Blue) });
// Ensure RichTextBlock has passed a measure step now with the new inlines added, so that its HasOverflowContent is updated.
rtb.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
// Keep deleting chars until "... Continue Reading" comes into view
idx = paragraph.Inlines.Count - 3; // skip the last 2 inlines since they are "..." and "Read More"
while (idx >= 0 && rtb.HasOverflowContent)
{
Run run;
if (paragraph.Inlines[idx] is Hyperlink)
{
run = ((Hyperlink)paragraph.Inlines[idx]).Inlines.FirstOrDefault() as Run;
}
else
{
run = paragraph.Inlines[idx] as Run;
}
if (string.IsNullOrEmpty(run?.Text))
{
paragraph.Inlines.Remove(run);
idx--;
}
else
{
run.Text = run.Text.Substring(0, run.Text.Length - 1);
}
// Ensure RichTextBlock has passed a measure step now with the new inline content updated, so that its HasOverflowContent is updated.
rtb.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
}
}
private static void DeleteCharactersFromEnd(InlineCollection inlines, int numCharsToDelete)
{
if (inlines == null || inlines.Count < 1 || numCharsToDelete < 1) { return; }
var idx = inlines.Count - 1;
while (numCharsToDelete > 0)
{
Run run;
if (inlines[idx] is Hyperlink)
{
run = ((Hyperlink)inlines[idx]).Inlines.FirstOrDefault() as Run;
}
else
{
run = inlines[idx] as Run;
}
if (run == null)
{
inlines.Remove(inlines[idx]);
idx--;
}
else
{
var textLength = run.Text.Length;
if (textLength <= numCharsToDelete)
{
numCharsToDelete -= textLength;
inlines.Remove(inlines[idx]);
idx--;
}
else
{
run.Text = run.Text.Substring(0, textLength - numCharsToDelete);
numCharsToDelete = 0;
}
}
}
}
I have the following in a Section:
_favElement = new StyledStringElement (string.Empty);
_favElement.Alignment = UITextAlignment.Center;
if (_room.IsFavourite) {
_favElement.Image = UIImage.FromBundle ("Images/thumbs_up.png");
_favElement.Caption = "Unmark as Favourite";
} else {
_favElement.Image = null;
_favElement.Caption = "Mark as Favourite";
}
_favElement.Tapped += favElement_Tapped;
Then when I press the element I want the following to happen:
private void favElement_Tapped ()
{
if (_room.IsFavourite) {
_favElement.Image = null;
_favElement.Caption = "Mark as Favourite";
} else {
_favElement.Image = UIImage.FromBundle ("Images/thumbs_up.png");
_favElement.Caption = "Unmark as Favourite";
}
_room.IsFavourite = !_room.IsFavourite;
}
However the image and text does not change in the actual element when the element is tapped. Is there a refresh method or something that must be called? I've also tried changing the Accessory on Tapped as well and nothing changes. The properties behind do reflect the correct values though.
An alternative to reloading the UITableView is to reload the Element using code like this (copied from Touch.Unit):
if (GetContainerTableView () != null) {
var root = GetImmediateRootElement ();
root.Reload (this, UITableViewRowAnimation.Fade);
}
assuming that your code is in DialogViewController,add this
this.ReloadData();
but in your case I recommend you to use BooleanImageElement
Using sharepoint build in lookup column and it set to required field. SharePoint automatically selects the first item in the dropdown box (kinda misleading for the end users).
Is there a way to display blank or Null for the first row of this drop down box?
(I am open to any solution. I prefer javascript type solution)
For Choice fields, the default value is configured in the column settings. If the "Default value" input box is populated, delete the value in order to use no default value.
Edit
For Lookup fields, the field seems to change dramatically if it is required. Fields that are NOT required have a "(None)" value by default. However, toggling the field to required will remove the "(None)" value and the first value is selected automatically.
One thing I found, is that if you use JavaScript to add the null value to the dropdown and then try to press OK you get an error page: "An unexpected error has occurred." As a workaround, I wrote some more code to do a quick validation that the field has a value before the form is submitted. If the field has no value, then it will prompt the user and cancel the submit. (Note: this code is only attached to the OK buttons so you may get errors while editing EditForm.aspx.. just choose a value for your lookup field and you'll be able to edit like normal)
Anyways, onto the code... I think the only line you'll need to change is var fieldTitle = 'Large Lookup Field'; to update it to the name of your field.
<script type="text/javascript">
function GetDropdownByTitle(title) {
var dropdowns = document.getElementsByTagName('select');
for (var i = 0; i < dropdowns.length; i++) {
if (dropdowns[i].title === title) {
return dropdowns[i];
}
}
return null;
}
function GetOKButtons() {
var inputs = document.getElementsByTagName('input');
var len = inputs.length;
var okButtons = [];
for (var i = 0; i < len; i++) {
if (inputs[i].type && inputs[i].type.toLowerCase() === 'button' &&
inputs[i].id && inputs[i].id.indexOf('diidIOSaveItem') >= 0) {
okButtons.push(inputs[i]);
}
}
return okButtons;
}
function AddValueToDropdown(oDropdown, text, value, optionnumber){
var options = oDropdown.options;
var option = document.createElement('OPTION');
option.appendChild(document.createTextNode(text));
option.setAttribute('value',value);
if (typeof(optionnumber) == 'number' && options[optionnumber]) {
oDropdown.insertBefore(option,options[optionnumber]);
}
else {
oDropdown.appendChild(option);
}
oDropdown.options.selectedIndex = 0;
}
function WrapClickEvent(element, newFunction) {
var clickFunc = element.onclick;
element.onclick = function(event){
if (newFunction()) {
clickFunc();
}
};
}
function MyCustomExecuteFunction() {
// find the dropdown
var fieldTitle = 'Large Lookup Field';
var dropdown = GetDropdownByTitle(fieldTitle);
if (null === dropdown) {
alert('Unable to get dropdown');
return;
}
AddValueToDropdown(dropdown, '', '', 0);
// add a custom validate function to the page
var funcValidate = function() {
if (0 === dropdown.selectedIndex) {
alert("Please choose a value for " + fieldTitle + ".");
// require a selection other than the first item (our blank value)
return false;
}
return true;
};
var okButtons = GetOKButtons();
for (var b = 0; b < okButtons.length; b++) {
WrapClickEvent(okButtons[b], funcValidate);
}
}
_spBodyOnLoadFunctionNames.push("MyCustomExecuteFunction");
</script>
In response Kit Menke, I've made a few changes to the code so it will persist previous value of the dropdown. I have added the following lines of code to AddValueToDropdown()....
function AddValueToDropdown(oDropdown, text, value, optionnumber){
var selectedIndex
if (oDropdown.options.selectedIndex)
selectedIndex = oDropdown.options.selectedIndex;
else
selectedIndex = -1;
// original code goes here
// changed last line of code (added "selectedIndex+1")
oDropdown.options.selectedIndex = selectedIndex+1;
}
To improve on top of Aaronster's answer: AddValueToDropdown can be done that way:
var injectedBlankValue = false;
function AddValueToDropdown(oDropdown, text, value, optionnumber) {
for (i = 0; i < oDropdown.options.length; i++) {
option = oDropdown.options[i];
if(option.getAttribute('selected')) // If one is already explicitely selected: we skip the whole process
return;
}
var options = oDropdown.options;
var option = document.createElement('OPTION');
option.appendChild(document.createTextNode(text));
option.setAttribute('value', value);
if (typeof (optionnumber) == 'number' && options[optionnumber]) {
oDropdown.insertBefore(option, options[optionnumber]);
}
else {
oDropdown.appendChild(option);
}
// changed last line of code (added 'selectedIndex+1')
oDropdown.options.selectedIndex = 0;
injectedBlankValue = true;
}
This is needed for document libraries where "add" and "set properties" are two distinct pages.
And funcValidate starts with:
var funcValidate = function () {
if (!injectedBlankValue)
return true;
All these changes is to make the whole thing work with document libraries.
I have a CDialog and I am trying to override PreTranslateMessage like this:
BOOL CWeekendMeetingDlg::PreTranslateMessage(MSG* pMsg)
{
if (pMsg->message == WM_SETFOCUS)
{
if (::GetDlgCtrlID(pMsg->hwnd) != IDC_COMBO_PT_CHAIRMAN &&
::GetDlgCtrlID(pMsg->hwnd) != IDC_COMBO_PT_OPEN_PRAYER &&
::GetDlgCtrlID(pMsg->hwnd) != IDC_COMBO_WT_CLOSE_PRAYER &&
::GetDlgCtrlID(pMsg->hwnd) != IDC_COMBO_WEEKEND_HOST &&
::GetDlgCtrlID(pMsg->hwnd) != IDC_COMBO_WEEKEND_COHOST &&
::GetDlgCtrlID(pMsg->hwnd) != IDC_COMBO_PT_READER)
{
if (m_gridAssignHist.GetRowCount() != 1)
{
m_gridAssignHist.SetRowCount(1);
}
}
}
return CDialog::PreTranslateMessage(pMsg);
}
It is not working. What I want to do is reset my CGridCtrl row count to 1 when other controls gain focus (eg: edit combo). But if I put a breakpoint inside the first if it is never intercepted.
At the moment the only thing I can think of is to renumber all of the combo IDs on the dialog so they are sequential and then use a command range for OnSetFocus and detect in that handler. But there are also some CEdit controls.
Can't I use PTM though and avoid that? For me it seems it would be the easiest.
Here is the dialog:
At the moment I have 7 combo OnSetFocus handlers. When they fire the display specific assignment history in the grid on the right.
So if the user moves to any other control on the dialog, the assignment history control will not apply. And that was why i wanted to reset the history to just the header row. And I was hoping to do this with PTM.
Child control notifications are received in the parent dialog via WM_COMMAND messages. Overriding MFC dialog's OnCommand catches those notifications (CBN_SETFOCUS, EN_SETFOCUS etc).
void DoSomething()
{ /* ... */ }
BOOL CWeekendMeetingDlg::OnCommand(WPARAM wParam, LPARAM /*unused*/)
{
switch (HIWORD(wParam))
{
case CBN_SETFOCUS:
switch (LOWORD(wParam))
{
case IDC_COMBO_PT_CHAIRMAN:
// ...more combobox IDCs
DoSomething();
break; // or return TRUE to bypass any message map handlers
}
break;
case EN_SETFOCUS:
switch (LOWORD(wParam))
{
case IDC_EDIT_WHATEVER:
// ...more editbox IDCs
DoSomething();
break;
}
break;
// ...more notification codes
}
return CDialog::OnCommand(wParam, lParam);
}
I have added a 2 second timer to the dialog:
void CWeekendMeetingDlg::OnTimer(UINT_PTR nIDEvent)
{
if (nIDEvent == 1)
{
CWnd* pControl = GetFocus();
if (pControl != nullptr)
{
CWnd* pParent = pControl->GetParent();
if (pParent != nullptr)
{
int iCtrlID = pParent->GetDlgCtrlID();
if (iCtrlID != IDC_COMBO_PT_CHAIRMAN &&
iCtrlID != IDC_COMBO_PT_OPEN_PRAYER &&
iCtrlID != IDC_COMBO_WT_CLOSE_PRAYER &&
iCtrlID != IDC_COMBO_WEEKEND_HOST &&
iCtrlID != IDC_COMBO_WEEKEND_COHOST &&
iCtrlID != IDC_COMBO_PT_READER)
{
if (m_gridAssignHist.GetRowCount() != 1)
{
m_gridAssignHist.SetRowCount(1);
UpdateData(TRUE);
m_strAssignHistLabel = _T("Assignment:");
UpdateData(FALSE);
}
}
}
}
}
CDialog::OnTimer(nIDEvent);
}
This seems to work fine.