Is it possible to suppress single-click events during a double-click?
Our application supports single click and double-click events on a window which do different things. However we always get a single-click event during the double-click which causes undesired effects.
Our application is in Qt but really this is a question about underlying Windows/Mac APIs - is this a fundamental detail that the OS detects a single click as soon as you lift your finger since it can't possibly know you are going to click a second time, or can it be prevented?
If it can't be prevented, is their an accepted best practice how to handle it?
macos qt winapi
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
add a comment |
Our application supports single click and double-click events on a window which do different things. However we always get a single-click event during the double-click which causes undesired effects.
Our application is in Qt but really this is a question about underlying Windows/Mac APIs - is this a fundamental detail that the OS detects a single click as soon as you lift your finger since it can't possibly know you are going to click a second time, or can it be prevented?
If it can't be prevented, is their an accepted best practice how to handle it?
macos qt winapi
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
1
The behavior cannot be changed. The common approach to deal with this is a user interface design, where the single-click operation doesn't interfere with the double-click operation. E.g. in Explorer, a single-click selects an item, whereas a double-click invokes the default operation on the selected item.
– IInspectable
Nov 21 '18 at 15:50
add a comment |
Our application supports single click and double-click events on a window which do different things. However we always get a single-click event during the double-click which causes undesired effects.
Our application is in Qt but really this is a question about underlying Windows/Mac APIs - is this a fundamental detail that the OS detects a single click as soon as you lift your finger since it can't possibly know you are going to click a second time, or can it be prevented?
If it can't be prevented, is their an accepted best practice how to handle it?
macos qt winapi
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
Our application supports single click and double-click events on a window which do different things. However we always get a single-click event during the double-click which causes undesired effects.
Our application is in Qt but really this is a question about underlying Windows/Mac APIs - is this a fundamental detail that the OS detects a single click as soon as you lift your finger since it can't possibly know you are going to click a second time, or can it be prevented?
If it can't be prevented, is their an accepted best practice how to handle it?
macos qt winapi
macos qt winapi
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
asked Nov 21 '18 at 14:06
Mr. BoyMr. Boy
21.9k69238458
21.9k69238458
1
The behavior cannot be changed. The common approach to deal with this is a user interface design, where the single-click operation doesn't interfere with the double-click operation. E.g. in Explorer, a single-click selects an item, whereas a double-click invokes the default operation on the selected item.
– IInspectable
Nov 21 '18 at 15:50
add a comment |
1
The behavior cannot be changed. The common approach to deal with this is a user interface design, where the single-click operation doesn't interfere with the double-click operation. E.g. in Explorer, a single-click selects an item, whereas a double-click invokes the default operation on the selected item.
– IInspectable
Nov 21 '18 at 15:50
1
1
The behavior cannot be changed. The common approach to deal with this is a user interface design, where the single-click operation doesn't interfere with the double-click operation. E.g. in Explorer, a single-click selects an item, whereas a double-click invokes the default operation on the selected item.
– IInspectable
Nov 21 '18 at 15:50
The behavior cannot be changed. The common approach to deal with this is a user interface design, where the single-click operation doesn't interfere with the double-click operation. E.g. in Explorer, a single-click selects an item, whereas a double-click invokes the default operation on the selected item.
– IInspectable
Nov 21 '18 at 15:50
add a comment |
1 Answer
1
active
oldest
votes
Start a timer when you get WM_LBUTTONDOWN (or Qt equivalent). If you get WM_LBUTTONDBLCLK (or Qt equivalent) before the timer expires, cancel the timer and execute your double-click action. Otherwise, when the timer expires, execute your single-click event.
On Windows, you can get the double-click time using GetDoubleClickTime().
That's about the best you can do - you can't prevent the single click message being generated in the first place on either platform.
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
WM_LBUTTONDOWN,WM_LBUTTONDBLCLK? I would preferQt::MouseButtonconstants for this. ;-)
– Scheff
Nov 21 '18 at 15:22
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
add a comment |
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1 Answer
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Start a timer when you get WM_LBUTTONDOWN (or Qt equivalent). If you get WM_LBUTTONDBLCLK (or Qt equivalent) before the timer expires, cancel the timer and execute your double-click action. Otherwise, when the timer expires, execute your single-click event.
On Windows, you can get the double-click time using GetDoubleClickTime().
That's about the best you can do - you can't prevent the single click message being generated in the first place on either platform.
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
WM_LBUTTONDOWN,WM_LBUTTONDBLCLK? I would preferQt::MouseButtonconstants for this. ;-)
– Scheff
Nov 21 '18 at 15:22
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
add a comment |
Start a timer when you get WM_LBUTTONDOWN (or Qt equivalent). If you get WM_LBUTTONDBLCLK (or Qt equivalent) before the timer expires, cancel the timer and execute your double-click action. Otherwise, when the timer expires, execute your single-click event.
On Windows, you can get the double-click time using GetDoubleClickTime().
That's about the best you can do - you can't prevent the single click message being generated in the first place on either platform.
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
WM_LBUTTONDOWN,WM_LBUTTONDBLCLK? I would preferQt::MouseButtonconstants for this. ;-)
– Scheff
Nov 21 '18 at 15:22
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
add a comment |
Start a timer when you get WM_LBUTTONDOWN (or Qt equivalent). If you get WM_LBUTTONDBLCLK (or Qt equivalent) before the timer expires, cancel the timer and execute your double-click action. Otherwise, when the timer expires, execute your single-click event.
On Windows, you can get the double-click time using GetDoubleClickTime().
That's about the best you can do - you can't prevent the single click message being generated in the first place on either platform.
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
Start a timer when you get WM_LBUTTONDOWN (or Qt equivalent). If you get WM_LBUTTONDBLCLK (or Qt equivalent) before the timer expires, cancel the timer and execute your double-click action. Otherwise, when the timer expires, execute your single-click event.
On Windows, you can get the double-click time using GetDoubleClickTime().
That's about the best you can do - you can't prevent the single click message being generated in the first place on either platform.
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
edited Nov 22 '18 at 18:28
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
answered Nov 21 '18 at 14:32
Paul SandersPaul Sanders
5,0451621
5,0451621
WM_LBUTTONDOWN,WM_LBUTTONDBLCLK? I would preferQt::MouseButtonconstants for this. ;-)
– Scheff
Nov 21 '18 at 15:22
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
add a comment |
WM_LBUTTONDOWN,WM_LBUTTONDBLCLK? I would preferQt::MouseButtonconstants for this. ;-)
– Scheff
Nov 21 '18 at 15:22
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
WM_LBUTTONDOWN, WM_LBUTTONDBLCLK? I would prefer Qt::MouseButton constants for this. ;-)– Scheff
Nov 21 '18 at 15:22
WM_LBUTTONDOWN, WM_LBUTTONDBLCLK? I would prefer Qt::MouseButton constants for this. ;-)– Scheff
Nov 21 '18 at 15:22
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
@Scheff Sure, if that is easier, I don't know Qt
– Paul Sanders
Nov 21 '18 at 18:59
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
Can you clarify explicitly that single-click up/down events cannot be suppressed in your answer, as you imply and the comment on my question states? Just to make it more complete so I can accept it?
– Mr. Boy
Nov 22 '18 at 13:57
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
@Mr.Boy Done...
– Paul Sanders
Nov 22 '18 at 18:29
add a comment |
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1
The behavior cannot be changed. The common approach to deal with this is a user interface design, where the single-click operation doesn't interfere with the double-click operation. E.g. in Explorer, a single-click selects an item, whereas a double-click invokes the default operation on the selected item.
– IInspectable
Nov 21 '18 at 15:50