One small question. I need to have my selected treeview item stay visually "selected" even when focus is set on other component, anybody knows which property is responsible for that?
The property you are looking for is called
HideSelection
From the help:
Use HideSelection to specify whether
the user is given visual feedback
about the current selection in the
tree view when it does not have focus.
If true, the selected node is not
visually distinct from other nodes
until focus returns to the control. If
false, the node always appears
selected.
Related
I am using Delphi XE5.
I am trying to workout as per the Delphi's help about TToolButton component.
Delphi Help Says about TToolButton.AllowAllUp property:
Indicates whether all the tool buttons in a group can be un-selected at the same time.
If AllowAllUp is set to true, all of the tool buttons in the group can be unselected. If AllowAllUp is set to false, at least one tool button in the group must be selected at any time. (Determine which tool button is initially selected by setting its Down property to true.)
AllowAllUp is effective only when Grouped is true and Style is set to tbsCheck. Changing the value of AllowAllUp for one button in a group automatically changes the value for all buttons in the group.
What I have done is I have placed a TToolBar on the form and created three TToolButtons in it. Then AllowAllUp and Grouped property is set to True. Also, set Style property to tbsCheck.
When I run the application, and when I go on clicking all buttons one by one, then any one button is showing as selected, if i try to select or click on other TToolButton previous one becomes un-selected.
How to make AllowAllUp property working?
These properties all work as intended. It seems that you are misunderstanding the intent of these properties.
The documentation for the Grouped property says:
When an unbroken sequence of adjacent tool buttons each has its Grouped property set to true and Style set to tbsCheck, then no more than one of the buttons can be selected at the same time.
The AllowAllUp property is related and described like so:
Indicates whether all the tool buttons in a group can be unselected at
the same time.
If AllowAllUp is set to true, all of the tool buttons in the group can
be unselected. If AllowAllUp is set to false, at least one tool button
in the group must be selected at any time. (Determine which tool
button is initially selected by setting its Down property to true.)
AllowAllUp is effective only when Grouped is true and Style is set to
tbsCheck. Changing the value of AllowAllUp for one button in a group
automatically changes the value for all buttons in the group.
This property only has an impact when you group buttons, and what it does is control whether or not you can have zero buttons down. But once you have grouped buttons, never more than one of the group can be down at any one time.
You need to do the following:
Set Grouped to False.
Set AllowAllUp to False, not that it really matters but you may as well restore the default to avoid confusion.
Set the style to tbsCheck.
Once you've done this you can check and uncheck the buttons independently of each other.
I've customised the style of a Firmeonkey list box item in such a way that now it can consist of 4 TLables in it. Each of the lable has Alignment as alNone.
I'm setting position of each of them in my code whenever i need to add any item. I've observed that when my list has scroll bar and if first component is not visible (i.e. i've scrolled down enough) at that time if i re-add all the items again in list box, then the position of TLabels in first items (or items which are not shown) get distorted.
For setting positions I am using below code :
(tmpListBoxItem.FindStyleResource('txtCol2') As TLabel).Position.X :=
(tmpListBoxItem.FindStyleResource('txtCol2') As TLabel).Position.X + (tmpListBoxItem.FindStyleResource('txtCol2') As TLabel).Width;
Any suggesstions, how can i overcome this issue.
Regards,
Padam Jain
Firemonkey styles are repeatedly 'applied' and 'freed' as components appear and disappear from screen.
It is not enough to simply set properties of style objects once and expect those values to be remembered. What you need to do is either listen to the OnApplyStyleLookup event or override the ApplyStyle method of a custom component and use the same you have above to set the properties again.
This means you'll need somewhere to store the values you are going to set.
I would suggest for your situation that you subclass TListBoxItem so you can add suitable properties or fields and put your code in ApplyStyle.
The selected row of a tListView appears blue, but only when the control has focus. I'd like the selected row to always be displayed, whether the control has focus or not.
Set the HideSelection property to False.
Determines whether the list view gives a visual indication of which item is selected when focus shifts to another control.
Set HideSelection to false to provide visual feedback of the selected item in the list even when the list view does not have focus. Set HideSelection to true to show the selection only when the list view has focus. HideSelection does not affect the actual value of the selection, only the visual indication. Always setting HideSelection to false can make forms with many list views look too busy.
When you select multiple nodes of a JvTreeView, and then try to drag these nodes, the JvTreeView selects the node you clicked to drag, rather than initiating dragging all the selected nodes. You end up dragging only this single node.
Is it possible to drag multiple nodes in a JvTreeView? I am using Delphi 2007.
UPDATE: Oddly enough, if I hold down CTRL+SHIFT when dragging the items, I can successfully drag them all. Any ideas?
Suppose MultiSelectStyle is the default [msControlSelect], then the answer to your question is 'you don't release the control key when you're selecting the last item and beginning dragging'.
The culprit is in TJvTreeView.WMLButtonDown in JvComCtrls.pas. Code there tests if 'Ctrl' is pressed when the TreeView is MultiSelect, and clears all items and selects the clicked item if 'Ctrl' is not pressed. It should instead test if the clicked item is already selected and do nothing if it is.
You can see the broken behavior without dragging. Multi select a few items and then click a selected item with the mouse. The VCL TreeView do not select or de-select anything, while the JVTreeView, instead, de-selects all items and selects the clicked one.
Yes absolutely, I do it all the time.
Of course Multi-Select needs to be True and you may need to have a look at the TTreeView's MultiSelectStyle. That controls what type of nodes can be selected at the same time. For example if msSiblingOnly is set to true, you can only select sibblings.
Are you using dmAutomatic or dmManual. If the latter, it could be that you are doing something in the OnMouse* events that is negating the multi-selection you made earlier.
You can easily achieve a multicolumn effect in a listbox by setting the TabWidth property of TListbox. For example, http://delphi.about.com/cs/adptips2000/a/bltip1200_3.htm
I need to do the same in the drop down list of a ComboBox, but comboboxes don't publish any TabWidth property.
Any ideas?
In a comment to this answer advising you to owner-draw the list box items you say:
I'm wondering why I must do that when the required functionality already exists on a listbox
A combo box is actually composed of three native child windows - the combo box itself, an embedded edit, and a list box. You can use the GetComboBoxInfo() function to fill a COMBOBOXINFO structure (i.e. a TComboBoxInfo record) with information about the control, and it will return the 3 HWND elements in it. With that you are able to alter the appearance and behaviour of the list box. In principle.
For the list box to use the tab stops it needs to have the LBS_USETABSTOPS style flag set. Unfortunately this can't be turned on later, the list box has to be created with it. So you could use the functionality only if you were able to turn the style flag on for the list box, which is created during the CreateWindowEx() call for the combo box. AFAICS this can only be done by hooking the CreateWindowEx() call itself, identifying the internal call that creates the list box, and altering the passed style. This means runtime modification of code, and not in your executable but in a Windows DLL.
Owner-drawing the list items looks like it would be much easier.
From what I know there is not so simple way as TabWidth here but you can override Paint method and draw it yourself. Looking at listbox and combobox sources may help.