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@hebasto hebasto commented Feb 9, 2020

From Qt docs:

Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

Note: Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned QCharRef would cause a detach of the string, even if the string has been copied in the meanwhile (and the QCharRef kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

Since Qt 5.14 this causes a QCharRef warning if any modifier key is pressed while the splashscreen is still displayed.

Fix #18080.

Note: Ctrl+Q will also close the spashscreen now.

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brakmic commented Feb 9, 2020

Concept ACK.

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Tested on macOS Catalina 10.15.3 with Qt 5.14.1

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utACK ac57859

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hebasto commented Feb 9, 2020

@brakmic

Tested on macOS Catalina 10.15.3 with Qt 5.14.1

Thank you for your review and testing.

Usually, when a reviewer approves PR, he starts his message with ACK top_commit_hash ;)

@@ -137,7 +137,7 @@ SplashScreen::~SplashScreen()
bool SplashScreen::eventFilter(QObject * obj, QEvent * ev) {
if (ev->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
if(keyEvent->text()[0] == 'q') {
if (keyEvent->key() == Qt::Key_Q) {
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@laanwj laanwj Feb 10, 2020

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I think this slightly changes the behavior from accepting 'q' to 'q' and 'Q' (shift-q). But I'm fine with this, personally.

edit: oh, also ctrl-Q, as you mention in the PR desc.

laanwj added a commit that referenced this pull request Feb 10, 2020
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix #18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
@laanwj laanwj merged commit ac57859 into bitcoin:master Feb 10, 2020
@hebasto hebasto deleted the 20200209-deprecated-qcharref branch February 10, 2020 11:32
MarkLTZ added a commit to litecoinz-core/litecoinz that referenced this pull request Feb 13, 2020
- [0.19] wallet: Reset reused transactions cache bitcoin#18083
- 0.19: Backports bitcoin#17792
- psbt: handle unspendable psbts bitcoin#17524
- qt: Fix comparison function signature bitcoin#17634
- psbt: check that various indexes and amounts are within bounds bitcoin#17156
- [0.19] psbt: check that various indexes and amounts are within bounds bitcoin#18079
- [0.19] Final backports for 0.19.1 bitcoin#17988
- Bug: IsUsedDestination shouldn't use key id as script id for ScriptHash bitcoin#17924
- qt: Fix deprecated QCharRef usage bitcoin#18101
- gui: Throttle GUI update pace when -reindex bitcoin#18121
- gui: Fix race in WalletModel::pollBalanceChanged bitcoin#18123
- gui: Fix unintialized WalletView::progressDialog bitcoin#18062
- Bugfix: GUI: Hide the HD/encrypt icons earlier so they get re-shown if another wallet is open bitcoin#18007
- bug-fix macos: give free bytes to F_PREALLOCATE bitcoin#17887
- test: add missing #include to fix compiler errors bitcoin#17980
- zmq: Fix due to invalid argument and multiple notifiers bitcoin#17445
deadalnix pushed a commit to Bitcoin-ABC/bitcoin-abc that referenced this pull request Dec 22, 2020
Summary:
This change prevent a `QCharRef` deprecation warning if any modifier key is pressed while the spashscreen is still displayed, for Qt >= 5.14.
As a side effect, Ctrl+Q and Shift+Q will also close the splashscreen now.

This is a backport of core [[bitcoin/bitcoin#18101 | PR18101]]

Test Plan:
`ninja && src/qt/bitcoin-qt -regtest`
Press Q, or Ctrl+Q or Shift+Q while on the splashscreen.

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8741
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jun 27, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jun 28, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jun 29, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jul 1, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jul 1, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jul 14, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jul 14, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
PastaPastaPasta pushed a commit to PastaPastaPasta/dash that referenced this pull request Jul 15, 2021
ac57859 qt: Fix deprecated QCharRef usage (Hennadii Stepanov)

Pull request description:

  From Qt docs:
  - [`QKeyEvent::text()`](https://doc.qt.io/qt-5/qkeyevent.html#text):
  > Return values when modifier keys such as Shift, Control, Alt, and Meta are pressed differ among platforms and could return an empty string.

  - [`QString::operator[]()`](https://doc.qt.io/qt-5/qstring.html#operator-5b-5d):

  > **Note:** Before Qt 5.14 it was possible to use this operator to access a character at an out-of-bounds position in the string, and then assign to such a position, causing the string to be automatically resized. Furthermore, assigning a value to the returned `QCharRef` would cause a detach of the string, even if the string has been copied in the meanwhile (and the `QCharRef` kept alive while the copy was taken). These behaviors are deprecated, and will be changed in a future version of Qt.

  Since Qt 5.14 this causes a `QCharRef` warning if any modifier key is pressed while the splashscreen is still displayed.

  Fix bitcoin#18080.

  Note: Ctrl+Q will also close the spashscreen now.

ACKs for top commit:
  jonasschnelli:
    utACK ac57859

Tree-SHA512: a7e5559410bd05c406007ab0243f458b82d434b0543276ed331254c8d7a6b1aaa54d0b406f799b830859294975004380160f8af04ba403d3bf185d51e6784f54
@bitcoin bitcoin locked as resolved and limited conversation to collaborators Feb 15, 2022
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gui: deprecated QCharRef usage in splashscreen
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