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如果槽函数是耗时会导致UI假死的任务，connect时不能使用Qt::DirectConnection
。该参数The slot is invoked immediately when the signal is emitted. The slot is executed in the signalling thread.槽函数将会在信号线程中执行，所以还是会导致UI卡顿
enum Qt::ConnectionType
This enum describes the types of connection that can be used between signals and slots. In particular, it determines whether a particular signal is delivered to a slot immediately or queued for delivery at a later time.

Constant
Value
Description
Qt::AutoConnection
0
(Default) If the receiver lives in the thread that emits the signal, Qt::DirectConnection is used. Otherwise, Qt::QueuedConnection is used. The connection type is determined when the signal is emitted.
Qt::DirectConnection
1
The slot is invoked immediately when the signal is emitted. The slot is executed in the signalling thread.
Qt::QueuedConnection
2
The slot is invoked when control returns to the event loop of the receiver’s thread. The slot is executed in the receiver’s thread.
Qt::BlockingQueuedConnection
3
Same as Qt::QueuedConnection, except that the signalling thread blocks until the slot returns. This connection must not be used if the receiver lives in the signalling thread, or else the application will deadlock.
Qt::UniqueConnection
0x80
This is a flag that can be combined with any one of the above connection types, using a bitwise OR. When Qt::UniqueConnection is set, QObject::connect() will fail if the connection already exists (i.e. if the same signal is already connected to the same slot for the same pair of objects). This flag was introduced in Qt 4.6.

本文标签： 线程多线程QTconnectUI

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